Bottle Cap Pins
I have already done this as a program and it was very successfull.
I also made these as presents for my co-workers, using old novel covers.
They best way to get images that are small enough is to print them out using Windows Picture and Fax Viewer using the Contact Sheet print size.
Altered Mint Tins
I always saved my mint tins, hoping I could find what they were good for. I finally found it!
The collage paper will stick to the tins wonderfully if you apply the glue to the paper and stick it to tin. I use Mod Podge as a glue and sealer.
These are simple and look like you bought them at a specialty stationary store.
To make the envelope, just carefully unassemble the envelope and use it as a template to cut out and fold the comic pages.
For the images on the card, just white out the speech bubble and write in your own message.
Secret book boxes
Using book glue, paint the outside edges of the book. Use a Xacto knife or box cutter to cut out the middle of the book. Coat the inside of the 'box' with the book glue.
Paperback coin purse
Many old paperbacks have great funky covers. Go through your donated items and see what you can find!
Tear off the cover. Cover it with clear packing tape or contact paper. fold it into thirds. Sew it together to create a pocket with a flap. (You can also just use tape, but it's not a lot of sewing and makes it look much nicer.) use self stick velcro create a closure for your wallet!
You've heard of a Duct Tape Wallet...
Here's a Packing Tape Wallet!
What's great about this is that you can use anything... newspaper, sheet music, book pages...
Here is a scan of the directions: