Crumple a rag and form it into a sausage shape, then roll it down the wall surface to create a subtle effect resembling tumbling material. Rinse or change rags often. You can also rag-roll glaze or latex onto a wall for a similar but more dramatic effect.
Annie Sloan's Frottage: Paint one coat of the first shade, then while the second coat of the next colour is wet, take sheets of crinkled newspaper and rub it all over and then pull it off. The paper pulls off some of the paint revealing the first layer.