For stamp-a-stacks, the idea is to get everyone stamping 10 cards in a couple of hours. The cards need to be pretty simple, attractive, and with an embellishment (those are my rules!).
I borrowed this idea from Holly Endress, my downline in Virginia. She does some great stuff. Look here.
This Bashful Blue card uses Serene Snowflakes and words from Heard from the Heart. I stamped different snowflakes in Bashful Blue and Bermuda Bay inks on Shimmery White card stock, tied some polka-dotted Bermuda Bay ribbon in a knot after distressing the edges with the Cutter Kit, then layered on a distressed piece of Bermuda Bay that's attached to the front of the card.