I love the slim line cards. Not sure why I've just found out about them.
There are several challenges going on using a slim line card. I used 3 1/2x 7.
I've use a Unity stamp for my Party Girl. Did some paper piercing for her clothes. Punched several balloons out for the sides. The designer paper really makes the card come together!
Unity Stamp Co on Facebook
Simon Says Stamp: Wednesday Challenge blog: Slimline challenge