Many of you may have heard of a type of print called a "cyanotype" or "sunprint". Basically it is specially treated paper which, when a resist (image, object, etc.) is placed on it and it's exposed to UV light, a ghostly image will be left behind. That's really the quick and dirty explanation - I'm sure there's more science-y stuff in there, but that's not how I roll.
Anyhoo, I happened across this great website that sells pretty much anything you can imagine with regard to sun printing. I purchased a silk sunprint scarf and, using vintage skeleton keys and escutcheons, made a really pretty and interesting scarf.
During the process:
And after (please excuse photos, they were taken with my phone after two cups of coffee!):
If you can tell in the "before" shots, the fabric is sort of green and slightly stiff. After the exposure and the rinsing, the fabric turns an amazing blue with variations from robin's egg to cobalt. This is a really fun project and would make an amazing gift for someone! You can visit Blueprints on Fabric for more inspiration and a list of products.