every so often I take mine and trim them down to squares of various sizes, then store them in stackable plastic bins, and then when I need to do something mindless I just start chain piecing and by the end of the day I have a top done.
I also use them to fill in around blocks that I've cut from panels and set them randomly in the squares.
Strips go to string quilts.
We use a lot of these quilts here locally for the foster care kids, nursing home, and burn out victims. We have also done fundraisers for the local fire departments and other non profits.
Doing quilt as you go is another nice way to use these up.