I really like it. The colors are very pleasing to the eye. the abstract shapes are great, and so is the render. One suggestions, that blue line above the black one on the left side...it's screaming put text on me!
Oh right. It's not bad, but I wanna see something bigger. And I mean that literally. Your sigs are more often than not, very pleasing to look at. But with a 500 x 120 limit, you can't really show us much from a sig. I recommend 500x500 for a decent start off size, then work your way up.