How can I use this frame (picture attached)?

Here are a bunch of ideas for repurposing window frames: https://www.diyncrafts.com/23989/repurpose/40-simple-yet-sensational-repurposing-projects-old-windows

Thank you. I will take a look at them.

You could put pictures in each space, scrapbook paper, put hooks on it and hang things from it.

Mary....You can find fabric you like and cover back, add roping/ribbon from side to side and attach pictures with tiny clothespins.

I put mirror in the old window frame I have, just cut the mirror the size you need, if you can't cut it yourself, the place that sells mirror will cut it for you

https://www.hometalk.com/search/posts?filter=window%20upcycle

You could make designs in the panes with glass nuggets or you could paint them as faux stained glass.

Check out some of these frame ideas here on Hometalk:

https://www.hometalk.com/search/posts?filter=frame