I knocked up a few bases for my Rackham models (yet to be painted) and put together a tutorial as well. Nothing mind blowing but thought it might be useful to someone.
Tutorial linkyA word of warning though, the images don't always load (Webs is awful!!! I cannot recommend it... at all) so if you get the impression there should be an image somewhere and there isn't, try refreshing the page and it should appear.