I also do a lot of adapting my own recipes.
But that said, good PP friendly cookbooks are Fran McCullough's classic "Low Carb Cookbook," Karen Barnaby's "Low Carb Gourment," George Stella's "Low Carb and Lovin' It." The Drs. Eades have written three or four cookbooks, and the kitchen forum on their PP website has a pretty good collection of PP compatible recipes. Hope this helps.