I didn't know that light has blob like nature (besides its corpuscular-wave dualism) I wouldn't go for 3D version of the logo, cause it referes to diffraction of light rather than intersection of quicksilver drops.
it should be best to get it B/N, more...classical , if i can say...more serious as well ! waiting for more opinion...but this n°2 looking really good and original ! (front of the other render's logotype) @+
From Auroville - Tamil Nadu - South India KOLAM Computer Training Center "Open source software development section"