3D Fireflies is another entry from Go Wallpaper Dev, which may or may not be related to Go Dev (makers of Go Launcher and Go SMS). Visually, it looks rather impressive, though it really doesn't have anything to do with fireflies, but just a bunch of "diamond shapes" fly around leaving very colorful trails.
As a LWP it is pretty colorful, though it eats up memory and CPU quite a bit. if you have a hefty phone, definitely give it a try.
Rating: Get it (unless your phone is too wimpy)