I've finally added a link graphic page to Sandsday. Now you can support Sandsday by adding a pretty picture to your site! The navigation is now significantly different, no longer using the main site's sidebar.
The leaderboard (728x90) and skyscraper (160x600) images are bigger than I know what to do with at the moment, so I don't recommend using them. Not that you would expect to use them for regular linking as opposed to ads in the first place.
(I have some idea of what I might do with the skyscraper down the line, but the leaderboard is a bit more vexing.)