this tutorial at Noodlehead. I did the interfacing a little bit differently than in the tutorial (I wanted to use some heavy fleece-type sew-in interfacing I happened to have in my stash to give it extra stiffness, and I ended up wonder-undering all of the layers together), but it was much easier than I thought it would be and it came out really well! It has handy card pockets and a divider inside:
this tutorial. It was pretty easy, and seems like magic! I filled it with two miniature bottles of nail polish and Santa put it into someone's stocking.