Paint a piece of wood (could paint a solid color, or paint a design/pattern like this one), sand and distress/age the corners, then attach a regular picture frame on top. These are about $150 in gift/home decor stores.
how to make your curtains gather perfectly, plus other easy DIY curtain ideas
DIY: Soap Pouch. Better than loufas
book shelves pallet
Color Your Craft Room
love the way this is all laid out
Shoe box lids, scrapbook paper, modge podge, letters, ribbon, and a curtain rod.....LOVE THIS IDEA!