I had this idea last year to make a picture that opened and jewelry could be stored behind it, so I was going to make my own box from scratch, but my mom found this shadow box that has a hinge and magnet so it could be easily opened... then this past year Wal-Mart started carrying the exact thing I wanted to make! this is why when you have an idea you need to jump on it right away! anyhoo... this is my version from the premade hinged shadow box.
after your have your pictures and foreground in place, it's time to finish the inside.
the back of the picture board looked like crap when I got it all glued up, so I covered it with a piece of cardboard and some fabric since it's visible when opened. also gave me another surface to put pins in - just remember if you do that not to poke through your pictures!!
anyway - got a little ahead of myself there! - I cut my board so it was a snug fit inside the part that holds the glass in so I didn't need to do anything but press it into place for it to stay. you may need to use some tape or something not so permanent to fix it into place if the inside of your frame doesn't have enough of a lip.
mine came with a fabric covered board that you can push pins into on the back, but if yours doesn't you can take a piece of foam or cardboard or more foam board that fits snug inside the box and cover it with fabric so you have a place to push the pins into to hang your jewelry on.
you can also have more permanent hangers and find small hooks and knobs to attatch to the back of the box with screws. I want to be able to have the freedom to move mine around so I just put beads on pins.