Jenny is pretty clear that her fortay is making something old new again. She found a new way to make HST and she utilizes precuts. Most of the blocks she uses in in videos is a block someone else has made, she just has figured out the short cut precut way.

You can use any pattern you bought or got off of the tutorials to make a quilt you want to sell. Just don't take credit for designing that block you use, chances are... someone else did it a long long time ago.