I picked up a set of these Orla Kiely Abacus bath towels (and hand towels, and washcloths) this morning from Fab.com. I think they'll go great in the Airstream bathroom and it'll be nice to change it up a bit since we've had the same towel set for the past three years. (Can you believe it???)
Also, from Orla Kiely's own website, this great beach towel:
Orla Kiely is an Irish-born designer living and working in London. You can find more of her designs here on her website.