I really like both entry #13 and entry #2. They aren't quite right, but you are definitely on the right track. I understand why you did th half spade in #13, but it just feels a little unbalanced. On #2, could you perhaps try it a little less realistic and more "flat". I looks good, but i am not sure it will transfer well to a nice paper for letterhead. I do like the red surrounding the spade and the way that mirrors the red in the font below.