Derf commented on how much he liked the cat banner of "him". Well, here's a page of blank ones:
kitty banners

All you have to do is copy the blank and using MS paint, add text. Just make sure you use the text option as "transparent" or you will have a big white box. Then just upload to your photohost and add the URL to your sig...

Toolmaker

MS paint? Transparent, PHOTOHOST? As I said,I can type and hit enter. Beyond that I am a computer illiterate, and I am not kidding! derf