This is a little 3x3 card I've done as a Make & Take at a couple of my workshops. I *love* this flower stamp from Petal Prints - it's just so pretty. I have the guests color the stamp w/ markers (Bashful Blue and Creamy Caramel) and the word "smile" is from the Simple Sayings II set (I have them color just the 'smile' w/ a black marker).
At my most recent w/s I showed them how I mounted the 3x3 card onto a A2 sized card (4.25" x 5.5"):
I mounted the card onto a piece of Basic Black CS that I used the slit punch on to hold the card closed. 
I love using them this way - you can add a "secret" message inside the 3x3 card - so neat!
Then I saw this week's sketch challenge. It has the COOLEST sketch that uses a 3x3 card!! I quickly stamped this earlier today (during the 10 whole minutes I had to stamp!! LOL):
I just used the same 3x3 card I made for the w/s and mounted it on the card using the Sketch Challenge directions. This is how the card opens:
Cool eh?
To make a card like this you only need a card base (4.25x5.5"), the large flap (4"x8.5" scored @ 3.25") and a 3x3 card (or a piece of 3"x6" CS scored @ 3"). On mine I added a layer of Black CS behind the Caramel for some added definition.
SETS: Petal Prints, Simple Sayings II, Linen. CS: Whisper White, Creamy Caramel, Bashful Blue, Basic Black. INK: Creamy Caramel, Bashful Blue, Basic Black. ACCESSORIES: Taupe Grosgrain Ribbon, Slit Punch, White Uniball Gel Pen, Paper Piercer.
