I am thinking of making a picnic/beach quilt. We have been going to a lake a lot lately and I want a better place to all hunker down then a beach towel. You know, sit and have lunch or sit and watch the kids swim. Would it be crazy to make a quilt for this purpose? If so, what would you back it with? Or batt it with, since it will get damp? I read an article where they backed a favorite blanket with fabric shower curtain because grass and sand didn't cling to it.

Thoughts? Am I nuts?