I've been playing a bit with freeform strata. They are cut with a rotary cutter, the edge is ironed under and then topstitched to the next layer. No freezer paper involved, no tricky curve piecing. Very simple and fun, and so freeing to let go of precision!
The book that inspired me is Karen Eckmeyer's Layered Waves.
http://www.amazon.com/Layered-Waves-...7007156&sr=8-1
Edit: forgot to say, Karen works with either FQs or full-width lengths of fabric. FQ lengths are easier to handle than full widths (fit on the cutting mat and all that...). The full widths are worth it when you want really looong waves on your quilt; probably not so much for cutting the strata into squares.
Hope this helps, and I'd love if you post pics! :D