Ron van der Kolk on Twitter: "6 identical 2x4 LEGO bricks, you can combine in 915.103.765 unique ways. Each guest receives a unique combination at LEGO House. #LEGO https://t.co/YFzzk0dEzU" / Twitter
LEGO 2x4 Dark Bluish Grey Gray Brick Lot of 10 #3001 NEW 2 x 4 Star Wars Color | eBay
LEGO 2x4 Brick - 3001- Choose Color x50 Brand New Gray Dark Black White | eBay
LEGO® colour chart reference | New Elementary: LEGO® parts, sets and techniques