These were some quick and simple little Christmas Post It note holders I created. I didn't get this idea from just one place, there are lots of these on the internet so if you want some more ideas just do a search and I'm sure you will come up with lots.
When working out your measurements you want to add 1/8" to the length and width of the post it notes that you are using, plus some for the depth. I split my mini post it note into four pieces (a whole one is a bit fat). On the front I used the Christmas 'Joy' Stamp from the Stampin' Up! Perfect Punches Stamp Set and the Holly Jolly Rub Ons (which go perfectly with the Jolly Holiday DSP).
The Crop A Dile is perfect for punching a hole through the whole lot with such ease, for the ring thingy (I just can't remember what they are called at the moment). I added a sparkly brad I had picked up somewhere on my travels and Voila - a cute little post it note.