I gave my DSIL's a box to put some special outgrown clothes in. When the collection becomes big enough, I will make a T-shirt quilt. I got a Rubbermaid Box and taped on a description of what types of clothes could go in the box for a T-shirt quilt.
You could make one of those things that drape over the grocery cart, a little girl purse, an advent calendar... the ideas go on and on.