diff --git a/pkgs/image-generator/default.nix b/pkgs/image-generator/default.nix
index 2c8e911..1a120f6 100644
--- a/pkgs/image-generator/default.nix
+++ b/pkgs/image-generator/default.nix
@@ -6,8 +6,8 @@ mkDerivation {
   version = "0.1.1.0";
   src = fetchgit {
     url = "https://git.ingolf-wagner.de/palo/image-generator.git";
-    sha256 = "19f6zj06avcqk711yx88z9ymyibci4qcb4r7fjpjxqvi702kvc1f";
-    rev = "a4d68ceca2e8e72cf75055b3796dd57b19265226";
+    sha256 = "0hgbp0sxy7vjgx2zv1r05gvry0k6r2cldjmj5q75d9c8gp6n5cc1";
+    rev = "ef68d8bd027b69fc96f821849c695a2b3e5c9e49";
     fetchSubmodules = true;
   };
   isLibrary = true;
diff --git a/system/desktop/home-manager/xmonad/Main.hs b/system/desktop/home-manager/xmonad/Main.hs
index ad4c595..f6d5ced 100644
--- a/system/desktop/home-manager/xmonad/Main.hs
+++ b/system/desktop/home-manager/xmonad/Main.hs
@@ -2,7 +2,6 @@
 
 module Main where
 
-
 import           BoringWindows                    (BoringMessage (..),
                                                    boringWindows, clearBoring,
                                                    focusDown, focusUp)
@@ -48,21 +47,20 @@ import           XMonad.Util.Scratchpad           (scratchpadManageHook,
                                                    scratchpadSpawnAction)
 import           XMonad.Util.SpawnOnce            (spawnOnce)
 
-
-
 ------------------------------------------------------------------------
 --
 -- Layouts
 --
 ------------------------------------------------------------------------
-
 selectionColor :: String
 selectionColor = Solarized.magenta
 
 nonSelectionColor :: String
 nonSelectionColor = Solarized.base02
 
-myLayout =  (windowConfiguration $ smartBorders $ boringWindows resizeableTall) ||| noBorders Full
+myLayout =
+  (windowConfiguration $ smartBorders $ boringWindows resizeableTall) |||
+  noBorders Full
   where
     resizeableTall = ResizableTall nmaster delta ratio []
      -- The default number of windows in the master pane
@@ -71,10 +69,8 @@ myLayout =  (windowConfiguration $ smartBorders $ boringWindows resizeableTall)
     ratio = 1 / 2
      -- Percent of screen to increment by when resizing panes
     delta = 3 / 100
-
     windowConfiguration = configurableNavigation noNavigateBorders
 
-
 -- ------------------------------------------------------------
 --
 -- predefined workspaces
@@ -86,12 +82,12 @@ myWorkspaces :: [String]
 myWorkspaces = ["1", "2", "3", "4"]
 
 -- workspaces names to be used only by one program, partly spawning on startup.
-autoSpawnWorkspaces :: [ String ]
-autoSpawnWorkspaces = [ "-copyq" ]
+autoSpawnWorkspaces :: [String]
+autoSpawnWorkspaces = ["-copyq"]
 
 -- theses workspaces should not be removed by the workspace
 -- switch commands
-nonRemovableWorkspaces :: [ String ]
+nonRemovableWorkspaces :: [String]
 nonRemovableWorkspaces = myWorkspaces ++ autoSpawnWorkspaces
 
 -- projects
@@ -137,16 +133,15 @@ myKeys XConfig {modMask = modm} =
     -- mod-[1..9], Switch to workspace N
   [ ( (m .|. modm, k)
     , do removeEmptyWorkspaceAfterExcept nonRemovableWorkspaces $ windows $ f i
-         updateBoring
-    )
+         updateBoring)
   | (i, k) <- zip myWorkspaces [xK_1 .. xK_9]
   , (f, m) <- [(W.greedyView, 0)]
   ] ++
     -- mod-<shift>-[1..9] move window to workspace N
     -- mod-<control>-[1..9] copy window to workspace N
-  [ ((m .|. modm, k),
-     do windows $ f i
-        updateBoring)
+  [ ( (m .|. modm, k)
+    , do windows $ f i
+         updateBoring)
   | (i, k) <- zip myWorkspaces [xK_1 .. xK_9]
   , (f, m) <- [(W.shift, shiftMask), (copy, controlMask)]
   ]
@@ -301,15 +296,15 @@ myAdditionaKeys
            (do sendMessage MirrorShrink
                sendMessage Reset))
     -- Toggle window tiling/floating
-     , ("t", do
-          next <- nextRectangle
-          withFocused $ toggleFloating next)
-     , ("n", withFocused $ floatTileCommand
-             (do
-                 position <- nextRectangle
-                 withFocused (windows . (`W.float` position)))
-             (return ())
-       )
+     , ( "t"
+       , do next <- nextRectangle
+            withFocused $ toggleFloating next)
+     , ( "n"
+       , withFocused $
+         floatTileCommand
+           (do position <- nextRectangle
+               withFocused (windows . (`W.float` position)))
+           (return ()))
     -- Increment the number of windows in the master area
      , (",", sendMessage (IncMasterN 1))
     -- Deincrement the number of windows in the master area
@@ -344,7 +339,13 @@ myAdditionaKeys
     -- Redshift
     --
     -- ------------------------------------------------------------
-  [("M4-<F9>", spawn nixStartRedshift), ("M4-<F10>", spawn nixResetRedshift)]
+  [("M4-<F9>", spawn nixStartRedshift), ("M4-<F10>", spawn nixResetRedshift)] ++
+  -- ------------------------------------------------------------
+  --
+  -- programs
+  --
+  -- ------------------------------------------------------------
+  [("M4-b", spawn nixSetBackground)]
 
 ------------------------------------------------------------------------
 -- Mouse bindings: default actions bound to mouse events
@@ -373,8 +374,6 @@ mouse XConfig {XMonad.modMask = modm} =
     -- you may also bind events to the mouse scroll wheel (button4 and button5)
     ]
 
-
-
 ------------------------------------------------------------------------
 -- Window rules:
 -- Execute arbitrary actions and WindowSet manipulations when managing
@@ -446,14 +445,14 @@ startUp
   spawn nixStartAlbert
   spawnOnce nixStartCopyq
 
-
 ------------------------------------------------------------------------
 -- Now run xmonad with all the defaults we set up.
 -- Run xmonad with the settings you specify. No need to modify this.
 --
 main :: IO ()
 main = do
-  xmonad     $ withUrgencyHook (SpawnUrgencyHook "echo emit Urgency ") $
+  xmonad $
+    withUrgencyHook (SpawnUrgencyHook "echo emit Urgency ") $
     dynamicProjects projects $
     -- debugManageHook $
     defaults
@@ -463,10 +462,10 @@ myTerm = nixStartTerminal
 
 -- make sure we never select a boring window
 -- when we select another workspace.
-updateBoring :: X()
-updateBoring = do focusUp
-                  focusDown
-
+updateBoring :: X ()
+updateBoring = do
+  focusUp
+  focusDown
 
 -- A structure containing your configuration settings, overriding
 -- fields in the default config. Any you don't override, will
@@ -508,7 +507,6 @@ defaults =
       } `additionalKeysP`
   myAdditionaKeys
 
-
 autoXPConfig :: XPConfig
 autoXPConfig = myXPConfig {autoComplete = Just 5000}