Here ya go, Angie.
Mushroom & Sour Cream-Filled Croissants
TNT - Mushroom & Sour Cream Filled Croissants
Edited to add a few more ideas:
Seems like eons ago (when I first started cooking), I made two pizzas in rectangular metal pans using the crescent roll/dough as the base. I would have to dig it out for the exact method, but basically you flatten & pinch the dough together & lay it out in the pan & bake - then add toppings of choice & heat till everything is melted & cooked through. A topping that may sound odd, but was very good, was tuna & sauteed strips of green peppers & onions, freshly-ground black pepper (shredded cheese & black sliced olives? Don't recall, but add what you like).
Calzone - Fillings can be ricotta, mozzarella, spinach, ham, mushrooms - any combo of ingredients you prefer, with a marinara dipping sauce.
A 'sweet' filling can be cream cheese & chocolate chips - or a rugalach (sp) filling i.e. raisins & chopped walnuts - or pie filling - apple, cherry etc.
On the savoury side - ground beef, diced onions, shredded cabbage and shredded cheese as a filling - like a Runza:
Or a Reuben.