I use the smaller square tablecloth for classes, it's the perfect size. I use push pins to hang it, with permission of course. And Rose Marie is right do not use a cheap one. Go to a good dept store that sells kitchenware and get one that has real flannel on the back, not the spidery batting. One good portable wall is to buy the cardboard pattern lay out board. It folds up and very lightweight. I covered one with flannel and it works great to stand on it's on. At guild we use foam board presentation boards covered in flannel. They stand up on a table top. You can find these at Staples, Office Depo and some WalMarts.