Oh! Flats are great as rags in the garage. Hubbie has quite a few in the shed. Even the one's that are a little thread bare are brilliant for grease from the car and other messy garage liquids.
As for MCN I'm at a loss, although I really liked the idea of making them dolls nappies for dd. Brilliant idea! Might have to make them smaller, depending on the size of the toy.