Here are all the boys with the Minecraft masks that I made. I printed these on my computer, with each boys alter-ego that they use in the game, using shiny brochure paper. Then I taped them to a plain cardboard box.
From left to right; Elmo, Steve, Batman, Ore Man, Creeper wearing sunglasses
Had the birthday cake made at a local bakery. I brought them a photo of a Minecraft cake and they did the rest. The kids loved it.