When I saw this challenge today I knew I had to get out some of my old corner rounders I bought 6 or 7 years ago on clearance one corners and punches a tiny teddy bear, one does a Tree, and one does a Heart.
After I got them out I somehow thought of Elementary colors Red, Yellow, Green, and Blue, then I added orange for the back of the card.
I went to find a Teddy, Tree, and Heart stamp to match with the punches. I stamped them Water Colored them with my Aqua Painters, and then matted them with the bright colors. I cuttled the matted papers with circles embossing folders and then attached it all the the card.
I will have (in about an hour) more detailed pictures where you can see the corners/punches better on my blog and more deets on this card too along with lots of tutorials, 3-D items, scrap pages paper and digital, and lots of cards at: