I'm guessing that if they were used there are some stains and weak spots, but if they aren't going to be used as is why not cut out the good parts and re-purpose them!
What about making pillows. Or if the fabric is sturdy enough you could make bags or totes from them. How about those mug rugs or candle mats that are so popular? They could be shared with the family then.
Recycle, recycle, recycle!!!