I would do as suggested above...choose your least favorite piece. Measure it and then put thru a regular wash cycle--exactly as someone would do with a quilt...maybe a dry cycle also (tho I line dry mine), and then iron and re-measure to see how much ''damage'' you have done. Only then would I put the labor and cost into actually designing the quilt. Your fabrics are beautiful and would make gorgeous purses---or pillows. Had you tho't of those?