wmblob shows some blobs moving around.
I'll be honest with you. the truth is: wmblob is a totally useless program. But unlike other totally useless programs (I won't name them here, because they're made by an enormous and rich company), it looks good and shows funny moving `blobs'. I'm sure you'll like it.
It's a nice dockapp for WindowMaker (see `www.windowmaker.org'), but it's probably going to run just as well with any other window manager.