If you're talking about the small image for the gametype, the name is mode-osu-small.png, mode-fruits-small.png, etc. with a 86x111 dimensionts8zs wrote:
how to change this? I tried selection-mode-osu-small & mode-osu-small but didn't work
http://osu.ppy.sh/ss/941510
You can also change the larger one in the background with mode-osu.png, etc. at a 500x500 dimension