Splash Screen Randomizer is a simple tool that launches in the background at startup and swaps out the Welcome Splash screen with a random splash screen from a folder that can be defined by you.

Changes:

Now use ANY of the major image formats(.bmp,.gif,.jpg,.jpeg,png,.tif) as your splash screen(the image is scaled and saved as a .png in your splashes folder)
The settings screen is now drawn dynamicaly(i.e. no scrollbars should be displayed when in portrait or landscape mode)
.bmp and .png files will be displayed/randomized if they are in your splashes folder
option added to replace your default splash(original splash is saved to your splashes folder)
Optimized code in several places and reduced overall size
Due to it’s size, the default splash included with the smaller version is black_shadow69’s black version below

http://forum.xda-developers.com/showthread.php?t=383838