I started by cutting out scalloped circles using my circle punch. I choose to cut of words/phrases that dealt with weddings or images on the card that were wedding related.
I then applied mod podge to the back of the scalloped circles with a paint brush and applied it to the canvas (the size of the canvas I used was 16 x 20). I was able to fit ten circles across and eight circles down. Allow the mod podge to dry for about 25 minutes. It is okay if the circles aren't permanently stuck to the canvas. Here's what it should look like...
I then applied two more coats of mod podge on top. Ensure you do not apply a heavy coat. Just a couple of light swipes with your paint brush should be sufficient. Allow the mod podge to dry about 25 minutes between coats. A nice glossy finish is made once dry. See pic below...
Here's the finished product hanging on our wall =)
Here's a closeup pic of the collage...
-Mod Podge: $6
-Wedding Cards: $0
-Canvas: $6.50 (50% off of $12.99)
-Paint Brush: $0 (already had)
-Circle Scallop Craft Punch: $6 (50% off of $12)