Im been thinking about making suet cakes for my birds. I can get grass fed lamb fat to use for the base. What else could i use in them and how to get get them to stay in the shape you want them? I was thinking meal worms, oats, corn, thistle, sunflower seeds, wild bird seed, dehydrated fruits and veggies, herbs. I like to give them to my cooped up birds for something to do and as a treat. Is this a good idea?