This display of Guatemalan burial dolls is an inexpensive one I got from Michael's I think. It has a fabric ground, no glass. They also have a line of frames with canvas backings and glass.

I just use straight pins to pin stuff right to the fabric. In fact, I bought a pair of beautiful beaded earrings from Joyce awhile back, and mounted & framed them this way. You only need a few straight pins, and you can insert them so they are almost invisible.

I can't find the framed earrings--we had to move last year, and they're probably still packed somewhere. :^( But I hope it gives you some ideas! :^)