Making Garden Art with Old Windows

There is some house demolition going on near a friends work place. She's been eyeing some windows in one of the houses to be torn down, and thinking she'd like to buy and use them in some garden project, but doesn't have a clear vision of how to use them and doesn't want to just collect junk and not use it.

This older home has four large, 16 light (pane) windows and also a smaller, but multi-light window in the door.

Any ideas I can pass along to my friend?

Seem's like I saw windows being used in a garden .... like a view into the garden .... someplace.