Yes, what you're looking at is exactly what you think it is: an HTC EVO battery door/cover made of Lego. Well, actually it's an original OEM battery door with Lego bonded to it with plastic cement, but it's just as awesome.
G&E reader Mike wrote in to tell me that while looking for a cool case for his EVO, he realized that he wanted something Lego-related. Since there was obviously nothing like that already on the market to choose from, he went ahead and made it himself.
After some research, Mike determined that plastic cement would work better than super glue or any other adhesive because it "essentially 'melts' the plastic together and bonds the pieces by 'melting' the two outer most layers of plastic and fusing them."
He sanded off the smooth rubber coating on the EVO's original battery door, cleaned it with some alcohol, used a set of calipers to make sure that the design he came up with would fit perfectly, and went to work.
He used specialty grill pieces of Lego to cover the speaker and LED flash, and then removed a circular spinning section that was in a square piece to use for the camera. Smaller squares and rectangles on the outer edges made the cover's curves easy to tackle, while round pieces made quick work of the corners.
Talk about total geekdom!