Yuppers, questions like these belong in the Community Questions & Feedback forumd, as Ty said. ^^; But if you want Trainer Cards, go to the Trainer Cards section in the Art Gallery. As for putting images in your sig, just wrap the url of the image in the [IMG*]url goes here[/IMG*] tag.
(without the *'s of course XD) Well, I hope your question's been answered. If you need anything else, feel free to PM me. Otherwise check out the FAQ before posting a question, please. ^^;
*closes*
~Kelsey