Which is the best software for making color wallpapers?

[MobileVisuals]

One of my customers want me to make animated and static color wallpaper versions of the Java animations I have on:

http://www.mobile-visuals.com/

Which is the best software for this?
Is there any online tutorial that can teach me doing wallpapers?

[mobilefun2005]

those are great visuals but if i send them to my phone my phone will be frozen rightaway.

[MobileVisuals]

Yes, I know. The visuals on the site are applets. They are only there for promotion use and will not work in a mobile. But we have produced midlet animations of the applets. These work on all Java-enabled mobiles, and have been licensed to one of my customers in Asia. But one of my other customers want animated and static color wallpapers instead. So I would like to know, which is the best software for making wallpapers?
Is there any online tutorial that can teach me doing wallpapers?