The effect is generated by "system_plugin_bg.rco". You can disable them, and you can change the background, but no alternate effects as-of-yet. The code is embedded deep inside the encrypted file, and we are not sure quite what it is. It may be a transparent animation, or perhaps just code.

If we could change it, (Requiring decryption, alteration, re-encryption), it would be something very similar. After all, what other effects could you possibly apply? Most effects would probably require a 3D engine, or an impossibly complex series of files and code. Even then, you've got the problem of the size limitations (Probably impossible to bypass).
So, on the whole, a new background effect seems fairly far-fetched as the situation lies. Sorry!

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