I had all of these supplies lying around the house - so cost to me - $0 for a fun project that took about an hour. If I had drew- or found other pictures it would have taken me less time.
1
Gather your supplies. I used a canvas and 24 kraft boxes I had lying around the house. You could of course use any kind of boxes, (altoid tins etc.)
2
Paint your canvas.
3
Find 24 images, numbers, magazine cut-outs for your box lids. I designed and sized these in photoshop with mini numbers in the corners. I printed them on matte photo paper so they would peel and stick - but you could print them on regular paper and glue them just as easily.
4
Separate lids and boxes. I lined up my boxes on the canvas to see where to glue them. You could measure them - but I just eyed it.
5
Using your trusty glue gun (or any kind of glue) glue your boxes to the canvas.
6
While that is drying, cut peel and stick your images to the front of your boxes.
7
Attach the lids back to the boxes.
8
Admire your lovely advent calendar. Don't forget you've got to fill those boxes with little surprises.
9
Display it on your mantle. And its easy to keep and store for next year!