THe first thing I thought of for the stud muffin was a muscular, flexed arm, but it wouldn't really fit in with the others if it was the only one with arms. So my next thought was the wrapper could be his muscley beef cake chest and abs! He could also be giving a flirty little wink?
I'm not sure if that idea would speak for itself, but the others surely do.
I don't have any suggestions, but that's probably because I really like the stud muffin idea!