I used the clear boxes I've been saving from Papertrey Ink stamp set purchases. They are perfect for 4 cards per box. I replaced the wrap-around labels with a gingham patterned paper and stamped with one of the sentiments from Live Life. I am very happy with how they turned out.
Cardstock: PTI Stamper's Select White
Patterned Paper: Memory Box gingham collection
Stamps: Tim Holtz Shabby Stripes, Hero Arts Live Life
Ink: PTI Summer Sunrise, Melon Berry, Aqua Mist, True Black, Memento Pear Tart
Size: 5.5" x 4.25"