Go to your local Walmart, Lowes, Home Depot or any store that has paint samples. Choose a red sample card and a green sample card, you can choose whatever shade of red and green you want. One red and one green sample card will creat one Chrismtas card. Depending on how many family members and friends you mail Christmas cards to, will determine how many paint samples to grab. For example I sent cards to 8 individual families so I grabbed 8 green sample cards and 8 red sample cards.
Start by cutting the edges off (where you can see the name of the paint color), then glue the cards together. The lines do not have to match up.
You will also need some Christmas stickers to decorate the front your card. I grabbed these at Walmart for $4.