I love to keep a variety of side projects going in the mix of life, often under the name of Biddlefufty. Currently, I'm growing several collections of illustrative work to add to Print-on-Demand sites. It's a little thrill to see stuff on products for the home and whatnot.
Society6 is good at offering a menagerie of POD products, my favorite being their tabletop and wall art pieces, many of which are found in my shop.
Red Bubble offerings include phone cases magnets and stickers currently.
Zip Pouches & Tote Bags
Over on Threadless, zip pouches, tote bags, buttons, and magnets are the order of the day.
Jewelry and Digital Downloads
Over on Etsy, I've offered various antique bronzed jewelry featuring existing images of stuff I've enjoyed over the years as well as digital downloads of fun holiday drawings for crafters to use in creating any number of homegoods.