The easiest way is to post a message in the signature thread, asking someone to do one for you, and either post or PM some pix of your cat for them to work with. There are some amazing designers on this site. And no, they don't charge, though I think it is nice to acknowledge their work. If you want to make one yourself, then do it using photoshop or some other edit programme, upload the finished sig to a picture storing site like Photobucket and then go to the 'edit signature' part of your profile to download it. ALso all free. But make sure you follow the rules as to sizing.