I finally altered a Target Mailbox!!!! I couldn't post it right away though because I sent it to my Cupidee for the Secret Cupid Swap.
I used the pink target box; Stamps: Love you Much; Paper: Candy Lane DSP, Close to Cocoa, Pretty in Pink and Whisper White; Accessories: Whisper White, Pretty in Pink and Riding Hood Red Taffeta ribbon, button bouquet.
If you need to know how to do this, visit this blog for very good step by step instructions! I filled this with chocolate and a little 3x3 notecard (see next picture) revealing that I was her secret cupid!
Here is the other stuff I sent my cupidee. I found the notepad at Michael's and cut some chipboard a little bigger than the notepad and covered it with Tea Party DSP.
I made a Double Pocket Bag (tutorial here) and filled it with a couple of embellishments. The bag is made using the Candy Lane DSP, the Love you Much stamp set, Riding Hood Red Taffeta Ribbon and the 3 heart punch.
I also sent her a craft keeper with some other little things, but I didn't take a picture of those!