Colors: Hmm, well I do like green. Or any dark colors. Not too bright.
Size: Not too large. Not too small. (:
Font: None. Or Any I guess.
Matching Avatar?: Nope. Surprise me.
Additional?: Well, surprise me for both the Sig and Avatar. o;
Not sure if you're allowing multiple images into one or not. So whichever works for ya.
If you use the second image, I'd like it to give chase o; And probably have it a bit faded in the background if possible.
Oh. A border around the Avatar would be nice.
But yeah. o-o
Take your time and such, no rush n,n And thank you if you don't reject x)