Here's what I did...
I used a few of those old and yuck Christmas cards that came in $2 packets that I didn't like the picture on or ones that I wouldn't be sending back like I do most years - cards from businesses or old bosses that where not your favorite person anyway...
Happy recycled card making!
Green-ness: 5/5 for reusing and recycling!
Frugal-ness: 5/5 for not spending any money except postage!
Time cost: Much longer than going to the shops and getting one at the news agents but much more sociable if you make cards with a coffee and a neighbour!
Skill level: Who cares!!! Anything hand made is automatically wonderful!
Fun -ness: A great sense of satisfaction to find a use for something that was just sitting uselessly around!