Two Pallets Coffee Table - a fun and easy build:
First, separate the top and bottom decks apart on a pallet. Next, fill in any gaps (or not) on one of the decks. Cut a 2x4" board to length, and mount it to the deck board. Then, install the casters to the 2x4". This creates a sturdy base. Use two sets of spacer block pieces, and simply stack them on top of one another. Finish off with a top deck, or in this case, just use a few more stringer boards to span across and create a table. You can make them as open or tightly filled as you like.