There is almost no limit to the amazing things you can do with an old window!
If you don't have one in your garage you should be able to pick one up for just a couple bucks when the garage sale / flea market season starts up in a few weeks.
You can even make a huge industrial size corkboard!
You will need:
an old window
cork (I used cork underlay for flooring- you can also buy cork rolls at the craft store and cut foamcore sheets to fit underneath the thin cork and support your pushpins)
glazier points
flathead screwdriver
You can make your old window like new first with a fresh coat of paint
(you might want to use a lead test strip first if you do not know the age of the window and the kind of paint used)
I like things to look a little aged so I am just going to leave this one alone.
Measure your openings and cut your cork to fit (1), using a flathead screwdriver and some glazier points attach your cork to the window frame (2), that's it (3) - easy peasy