I have lied about when this was posted to keep the Blogging Against Disablism Day announcement at the top of the page for a while longer. I have however created more banners for the purposes of placing them on narrow (150 pixel) sidebars. They are exactly 150 x 200, if that's of any interest to anyone.
This is the code for the black and white one:
This is the code for the colourful one:
I may add to this post if anyone else has any ideas or requests.