Originally Posted by lab fairy

Why cut up the sheet (or large piece of fabric) at all? Just draw squares on it and let them do their thing. You can still tie it (treat it like cheater cloth). I've dealt with hundreds of things like this and find the simpler the better.

You might draw up a letter requesting donation of such materials if you have a letter of Non-profit statement (check with the director of this camp group for a NPO number if required by your state for tax exemptions). A lot of places will donate, reduce prices, etc. I've done this a lot. You might be surprised by what you find.