Design advice requested

On a lark, I thought maybe I'd have some mugs made. I'm not planning to set up a shop, because I'm not interested in making money on selling stuff to people. The idea was just to buy a bunch of mugs for friends and relatives and for myself.

Here's my very basic image:



Not great, obviously. If anyone has a better idea for a logo/image, please let me know. And if you have an actual image that you're willing to let me use in exchange for a free mug, let me know that, too. Oh, yes, and it must be safe for work. Thanks.