I just purchased 2 sets of neon ground effects lights for my 02 zx6r. You can get them at www.tricktape.com
They're a little over $50 a set and come in many different colors. They're about the size of a pencil and connect to a switch which can be placed anywhere on the bike.
I haven't installed them on my bike yet, but the instructions advise to screw them on. I think i'll just try some really good tape tho.
Also, on a different subject, tricktape has a new product that hids your plates with the flick of a switch. Very cool!