Some of these ideas are great, but not really economically viable... Stuff like the sunnies, boxer shorts, ciggie holders, clocks, belt buckles and car badges would be great, but the set-up fees would be a killer.
Items like the backpacks, banners, beach towels, umbrellas, beanies, pens, and CD holders would be easier to get done, but, as pointed out below, we need to know that they'll sell.
Tim, if you can find enough people for a group buy of the race suits, I'm more than happy to get them embroidered as part of a batch of the usual SAU shirts/jackets.