How can I use simple wooden frames?

I took the backs off n removed the glass n used different materials to make jewelry holders...sm. decorative hooks on the side for necklaces then either wire, tiny braided rope like material or whatever suits the person's personality goes across from one side to the other attached with tiny nails or eyehooks so earrings can hang...was really fun n super easy.

I made a desk tray with mine years ago https://chemistrycachet.com/how-to-make-a-desk-tray/

Johanna: You can actually paint the frames all one color and use them AS the decor on a wall... with nothing in them... just of wall of lovely rectangles.

You can make custom trays with them:

https://www.toworkwithmyhands.com/2015/01/make-serving-tray-picture-frame-3-easy-steps.html

I made chalkboards using pre-made chalkboard from the hardware store .... https://www.homeroad.net/2015/05/diy-chalkboards-in-beautiful-frames.html