Nice family of cameras you have there.
If you have fun with the Graphlex and 4X5 try the 5X7 and see what a nice size neg that would make. (5X7 contact prints. Mmmmmmmm, tasty).
Try either camera with enlarging paper as "film" it's cheap and can be developed in a common paper developer.,
BTW older cameras like this frequently have pinholes in their bellows so check them before you start shooting.
There's also a good thread going along about 8X10 paper negs, you may want check it out