I'd start my framing the masks as art. how many are there? It seems "drama"or theatre theme in a subtle way would be nice.

Actually, I have two similar masks which I had professionally set on a fabric matte and framed. They are not enclosed in glass. The framer used fishing line to tie the mask in place. He sewed it to the fabric and then ran it through the eyeholes. Used a gold fabric and black frame and they are still hanging on my walls. But I cannot say the work was inexpensive. For us it was worth it as the masks were brought home from Venice and are momentos of a wonderful vacation.

There is a product that adds a glitter to paint, tulle tutu style for a bed skirt, stage like velvet curtains, a brass bed.

The nose of some of these masks comes out quite far. Particularly the one in the image. I find these masks more interesting when displayed at angles. Maybe you could hang them from the ceiling in a group, using nylon string so that it looks as if an invisible troupe s actually performing. It is tricky, but a lot more interesting.
Definitely the theme calls for some harlequin design in the room... And some vivid jewel colours.

@ ASV... I was thinking harlequin too and was just researching for pics.....how about a PINK theatre chair to go with the theme!!