I had a thought about team logos. There are obvious problems with allowing managers to upload images to Ottoneu. NSFW, Copyright.
So what if there was an extra, 1 character, logo field with color picker for foreground and background color, and a font picker (Google Fonts API). A team could pick a letter for their team, or cut and paste a UTF-8 symbol – like 
or 
or 
. Then, that “Logo” would be served up large, in the center of a square, on the team page.