If you read yesterdays post, you know I was looking for a way to protect my new curtains from sun damage. Are you ready for a really low tech solution?
1. Salvage old sheet from goodwill pile.
2. Rip in half.
3. Use magnets to adhere to vertical blind frame.
I used a cream colored sheet because I would actually like some light to filter through. However, you could always use a darker color for more of a black out effect.
And, if magnets wouldn't work in your situation, I would try thumb tacks or stick on velcro.
For more trash to treasure check out Reinvented!