I made a One-Punch Man theme a LONG time ago (back in November), and although it's already uploaded on the 3DSthemes site, I might as well post a preview here:
Download link can be found
here.
Bottom Screen is "animated", scrolling past the first eight issues of the manga front covers.
Folders are a generic yellow folder with a red fist in the middle.
The Background music is a looped version of the main theme for One-Punch Man, "The Hero!".
I would've included sound effects, but I have no clue how to incorporate them or even what sounds to actually use for this theme.
I plan on making more themes in the future, ut for now, this is all I have.