Tired of sandwiches. Any Ideas?

My nutritionist has me on a meal plan..Ive been doing great however, for lunch I either get a turkey, roast beef, or tuna sandwich. I have been on this for 2 months and I am getting tired of them. I need to stick to them and I can have mayo and stuff on them, but are there any other ideas on how to punch them up? Or any other healthy sandwiches I can try? I dont meet with my nutritionist until next thursday...I don't want to wait that long. Please help...Im going to die if I have to eat another sandwich!