Yeah...Skyrocket is really cool! Flocks is good to, but you have to tweak the settings a bit to get a smooth looking image.
Hyperspace is kinda cool too. And lattice is cool...but if you really stare at it you get kinda dizzy....lol
And I agree about the bugs...just having a color doesn't look as good as an image, I'm using a brick background for it and it looks much better.