My personal favorite is Greenflower Zone (WIP). It's very colorful and vibrant and puts me in a good mood. How about everyone else?
Honestly the standard Blue Streak theme is pitch perfect, and its variants likewise are pretty good. I think the GFZ theme has potential, but the blur effect on the background is a major turnoff.
SRB2MB Is Srb2 MESSAGE BOARD, we're talking about the themes (look bottom right!) you can change it.Sorry to ask, but what is SRB2MB? I thought it was the srb2 message board, but you're all talking about songs (at least I think Look-a-Like is referring to the Song of the OVA).