Jellymongers by Bompas & Parr
I've had this cookbook for a few years now. I love making gelatins. I love eating gelatins. I have to admit that this book was even one of my nephew's favorite books to flip through when he was over. He even helped me make a few. Since Jello, gelatins, and aspics were so popular in the 1940s and 1950s, I would highly suggest this book. There are simple gelatins, creamy gelatins, GLOW IN THE DARK (how awesome!) gelatin, etc. This is gelatin on a whole new level!
I am so depressed right now.