My mom does this....on the back of the quilt she puts blue jeans - we take them out to baseball games and to the park - they aren't just put away and used for the couch....
Depending upon the size of the quilt - my mom has charged $250 to $500 - the $500 was for the hard ones - she took hats, etc. flattened them out - etc. and it was LARGE - like a queen size bed one!
The inside is a really good batting too - so it's comfortable to sit on. I love that we can still enjoy my concert shirts (mine) baby clothes, etc. and have something to make me think of my mom!!! She loves me sooo much!