Is the old window still in the wall or separate?
Are you asking for craft suggestions on using it for an art project, or suggestions on how to repair or fix the old window?
Posting a picture of your window would enable us to instantly see what exactly you have to work with.
LOTS of ideas here Julie! I am working on an old screen right now! Have fun!
I've seen them used to make greenhouses, cabinet doors, room dividers....here's a link with more ideas:
There are lots of ideas here:
Here are some ideas for you: https://www.thespruce.com/repurposing-old-windows-as-wall-decor-1313548
I hung one in an unused entrance of my gazebo
Could you turn it into stained glass? Here is a project
Some of these are so cute I want to find some old windows! https://www.remodelaholic.com/how-to-use-old-windows/
You could use it as decor in a gallery wall or as a tray on a coffee table
So many way to use old windows. Does yours have glass still or none? Here are a few of mine, some with glass and some with no glass, all different looks! https://www.hometalk.com/36962500/easy-stenciling-on-an-old-window https://www.hometalk.com/32949358/how-to-display-old-match-packs-boxes-collection
How about wall decor like this: https://www.hometalk.com/13969477/diy-vintage-inspired-window-panes
Here is a creative idea https://www.simplenaturedecorblog.com/how-to-transform-a-window-into-a-chalkboard-garden-sign/