One thing i've tried is doing the stuff hamburgers. Haven't really cared for them. Always seemed more trouble than its worth. And doesn't really seem to effect the taste that much.
Something I do for the wife that she likes is mix all hte toppings in a blender to make a spread. I put chopped onions, relish, cherry tomatores, mustard, ketchup, mayo, shreaded chees in a blender. Blend, and make the spread. Same thing that would normall top but its all mixed together.