Maybe you could focus on colors rather than objects, if that makes sense? I like the idea of reds, and other bright colors, but maybe wait on the sports theme til he's a little older (assuming he likes sports). That way you won't have to worry about getting everything to match a pattern.
My likes in a nutshell:[URL="http://www.etsy.com"]Handmade stuff[/URL]
[URL="http://www.fiveunicorns.com"]The Denver comedy scene[/URL]