Simply that, the first two wallpapers for Lubuntu Raring Ringtail, with two versions, “normal” and “particle beam”. Usually Lubuntu uses a single soft wave, so if you’re asking about the inspiration for the new design, I’ll explain:
The double wave resembles a DNA helix. Particle beam radiation is used to create mutations on some genes. So the expectation is just a useful, improved and creative mutation of previous environments (yeah, too geek, I know).