One of the best vegan cook books I've come across: https://www.amazon.com/Gourmet-Vegetarian-Slow-Cooker-Sophisticated/dp/158008074X
Tips: you don't need to make all of your spices from scratch. Yes, the author recommends it and it might help with SOME dishes, but I think it's a huge waste of time. Some vegan-slow cooker recipies come out a tad bland. Salt, pepper, salsa, other sauces, and really any spice can be your friend here. Really take the time to learn what spices give a certain "feel" to your dish (i.e. you want "warm," use cinnamon or corriander. You want "fresh," red pepper flakes or ground ginger. Etc.), as well as the best way to compliment the other parts of your dishes. Final tip, learn your substitutes or at least get a favorite website to search for your substitutions. Good luck!
Hey, I know this is pretty late, but if you are still looking for something this book has a lot of good recipes in it. They have an Indian section as well as 6 or 7 other ethnic sections. Gourmet Vegetarian Slow Cooker.