Try:
-Mix 50/50 with breakfast sausage to make a lower-fat, cheaper alternative to sausage.
-I'm sure you've already done spaghetti, chili, tacos, and so on.
-Mix with ground bacon, or beef fat, to make better burgers. Burgers NEED a bit of fat to cook properly.
-Use to stuff peppers for chili rellenos
-Make a fatty and smoke it. Mix deerburger with cheese and bacon, smoke, eat
-Make summer sausage. You'll need to add seasonings, curing salt (morton tender quick) and some fat - maybe some cheese - then cure for 24 hours or more, then smoke. If you don't want to fool with casings, use corn shucks like you'd use for tamales, then smoke. You can even cheat and wrap your summer sausage in aluminum foil and bake in the oven. it's far from ideal, but comes out pretty good. The more fat you add, the better this will be.
-Make mississippi-style tamales. If you like, I can give a real recipe, but basically you mix meat with meal and buttermilk, add spices and fat, blend, form into tamales, wrap in paper, and boil. I could eat these every week, if not more. I love 'em.