I am wild for the subtle, printed patterns on the inside of certain envelopes. They're gorgeous, but rarely seen (except though a cellulose address-window, maybe), so it's fun to see what can be done with them by turning the envelope inside out.
A collection of paper butterflies on my wall...
and glassy "blue china" beads.From just two pre-used envelopes, I got almost 100 beads of various sizes. (If you're new to fine art of paper bead-making, there's a fantastic tutorial here) The triangles, which I rolled up around a spare piece of "music wire" I had lying around, were only about 0.5 - 1" wide by about 2" long, so it made for some very skinny beads. I ended up tearing off the last 1/4" of the skinny point since the frayed edge of the paper stayed glued down much better. I used a glue stick for the gluing, and then painted them with a high-gloss acrylic medium. This protects them against moisture, but also serves to make the colors pop a little more.
You can see what I did with these beads at Wardrobe Refashion.