DestroyFunc FuncFvwmStartThemeBackground
AddToFunc   FuncFvwmStartThemeBackground
+ I Exec exec fvwm-themes-images --sky --sky-colors "#000000,#ff0000,#ffff00,#00ff00,#0000ff,#a020f0,#000000" --pattern-type 1 --setroot --be-fast
#+ I Exec bggen black red yellow green blue purple black | xv -root -quit  -

DestroyFunc FuncFvwmStopThemeBackground
AddToFunc   FuncFvwmStopThemeBackground
+ I Nop