Just thought I'd share an oldie but goodie: Not reinventing the wheel, but a lot of fun & free!!!!!!!! Go to your local wallpaper store & ask them to save their old books for you. Make envelopes out of them. Not great for the real textured stuff if you want to mail them. (The stamps that have the adhesive backs stick to almost anything.) They have kids prints that look great attached to a Birthday present. Use a Sharpie marker or a Krylon pen & you're good to go! Tip: pay attention to the placement-take an envelope apart to use as a template & see how much fun you can have moving it around a piece of wallpaper. The Zig adhesive pens do the job keeping them together.