Below is a picture of a stuffed green pepper. It is vegetarian and pretty damn tasty:
4 medium to large green bell peppers, with tops and cores removed [any bell pepper will work]
1 can black beans, drained and rinsed
1 c shredded jalapeno jack cheese
3/4 c salsa
1/2 c frozen corn
1/2 c chopped green onions
1/3 c uncooked rice
1 tsp chili powder
1/2 tsp ground cumin
Combine all ingredients (not the peppers of course) in a bowl. Spoon filling evenly into each pepper. Place in crockpot and put the lid on. Cook on low 4-6 hours.
The dish below is chicken thigh stewed in salsa. You put a layer of salsa down, then the chicken (breast or thigh) and then cover with more salsa and cook on low for 4-6 hours. It was pretty good, but a little watery and didn't have a strong flavor. You would use this chicken as filling for burritos, tacos or whatever. I used only medium salsa and think I might try hot next time and maybe add some peppers and onions.
You can also slow roast food in a crockpot so I'll have to try that out sometime. It was one of the few kitchen gadgets that I did not own and only cost me $10 since I had a gift certificate to Amazon.