I've altered the following, but some of them I didn't photograph!
Address book
Altoids tin
Binder
Bookmark
Calendar
Canvas
CD or DVD case
CD tin
Chequebook cover
Clipboard
Clock
Envelope
Frame
Gift bag
Key chain
Packaging
Paint Can
Pizza box
Playing card
Puzzle piece
Slide mount
Tag
Trading card
Wooden letter
Wrapping paper
Those are some awesome ideas .... thanks for sharing them.