Another way to work the expensive fabric into your decor would be to make valances out of it, not entire window treatments. You can also incorporate reproductions instead of authentic items into your decor. Look for cheaper alternatives. As always, use what you have, and keep your eyes open for bargains and unusual alternatives. These were a wonderful alternative to the expensive animal skins and furs, and are cruelty-free.
Sheets are a great alternative to expensive window treatments.
We have seen linoleum used to make floorcloths and cardboard used as the base for beautiful cornices. Get some help. Check out our bulletin board and our discussion groups. Do a web search. There are online guides to upholstering fabric, learning all kinds of crafts, sewing, woodworking, just about anything you want to learn is online.