I always understood traditional colour blocking to be using blocks of colour but not necessarily using stamping, or is that just because I learnt it from scrapbooking? Just trying to understand if we're definitely meant to be using acrylic blocks for our challenge today. I've seen Tim Holtz do it with an inked-up foam pad..., and I used to just use fun foam sometimes.
Here's the tutorial from Resources for an acrylic block background -
Splitcoaststampers - Tutorials