What a nifty idea! if you want creative envelopes, go to Maps, map the route from your letter to the other person's mailbox. Print them up, fold them into 8 by 11 envelopes (or smaller if you are sending cards). This would be cool for pen pals
Patina--vinegar (white or apple cider) and salt. For small items, fill a quart yogurt container half full of vinegar, and sprinkle in about 1 tsp salt. Add any metal you want to 'age'. Seal if you touch items a lot
One dollar for each year in separate balloons. Then they pop them after cake and presents. What a great birthday idea! Paired with hanging balloons in the doorway of the kids bedrooms as a suprise for when they wake up . A new birthday tradition!
Add depth to spray bottle art by mixing touches of gold or silver leaf in with other colors. After all colors are added to the canvas, apply the gold or silver leaf to the surface using leaf adhesive and a small detail paintbrush.