Anybody have a use for the foam in old mattresses, or old mattresses in general? We have 3 twin mattresses - 2 cheapy foam ones from IKEA and a regular spring mattress from somewhere. The IKEA covers have the requisite little kid stains, but I think the foam could be repurposed perhaps? And the covers could be cleaned as well. They are all about 6 years old. Please, no phone calls.