Printed mugs are now available on Society6; I haven't done much by way of making my designs mug-ready yet, but I've sorted one or two. My magpies linocut and swan monoprint are both good to go, but I've also just uploaded two of my little piggies so that I could turn them into mugs for a couple of relatives. And that means you can get your hands on them too!
Society6 are running a different promotion everyday in the run-up to Christmas, so there are deals a plenty to keep an eye out for. Mugs are $15 (approx £9) each.