I googled play based preschool Ft Worth and found this. It allows you to search for type of program (i.e. playbased) and zip code. It may give you a good start.

http://www.savvysource.com/preschools/tx/fort-worth

I can tell you that a play based program worked great for my dd. Ours was a laboratory program in the local high school. I first went to visit just as a courtesy to a mom I knew - I had no desire to have dd be a lab rat for a high school child development class. I quickly fell in love with the program and have referred friends who also fell in love with it. No letter of the week at ours.

Keep an open mind and visit as many programs as you can. You may be surprised where you find your perfect match!