Check out these sites for ideas. You may borrow ideas from the many problems offered on these sites, but you must make the math problem your own. Be creative and remember to provide:
1.) Clear directions (test these and your problem with someone else!!)
2.) Answers/answer key to find solution on another sheet of paper
3.) Be creative and have fun!!
World of CryptoPics - The ultimate Nonograms/Griddlers site and software!