Ooh! hypnotic goodness!! There are a few I've made (though it's hard to get the animated ones small enough in the bytes for LJ to swallow), but the groovin dude up there, this one here, and some of the cooler animated ones I've found at www.jurko.net
It's all free and I've had no issues with spy ware or anything as yet (been about a year on & off that I've been visiting the site).

EDIT: For utterly fail accidental deletion of sentences!
:p