We made both of these items in a recent class. We used the Window Frames framelits and the Friendship Preserves stamp set to make this little shaped card. It's perfect for a quick note.
The above card can fit in a 3 x 3 envelope, which you can get from Stampin' Up - or you can make your own using Designer Series Paper and the Diagonal Score Plate, like we did. The center is blank so that you can add the recipient's name.