Dear Yildiz100, THank you for this great post. I have been doing my cookbooks by rainbow color, too, and am glad for all of the suggestions this has produced. Here are a few more for you in green and purple:
Green:
Essentials of Classic Italian Cooking by Marcella Hazan
Recipe Jubile by Junior League of Mobile
Miss Vickie's Real Food Real Fast Pressure Cooker Cookbook by Vickie Smith
Potatoes by Gisella Allkemper
The Frugal Gourmet Cooks Three Ancient Cuisines by Jeff Smith
365 Ways to Cook Pasta by Marie Simmons
Foods a la Louisiane by Louisiana Farm Bureau Women
Judy Zeidler's International Deli cookbook
Purple:
Crescent City Collection A Taste of New Orleans by The Junior League of NewOrleans
Hope this helps!