Another darling way to do this waterfall card is vertically, if you have a vertical stamp to put on the pull-out piece. That tutorial is here: http://www.splitcoaststampers.com/resources/tutorials/waterfall_card. Very cute variation, I think! You'd then want your fold to be at the top for the card to open at the bottom, whereas with this horizontal style, you have a choice to have it open @ either the left side or bottom. Otherwise, you can just use that tutorial & orient your pieces horizontally instead! Either way, it's a very fun card to create, so enjoy!!!
Paper: DCWV DP & solid cardstock
Stamps: Technique Tuesday's Wild Vines (still a special favorite!) & Stampendous Circle Talk Birthday
Ink: Tsukineko's VersaColors: Lavendar, Lime, Canary, Baby Blue & Marigold & VersaFine Black
Embellishments: Darice Eyelets/Washers; Yellow Stickles; ribbon from stash
Tools: Crop-a-dile; SU's Horizontal Slot Punch