What do you mean our brick selection is limited, we can have a total of 4,032 different flat plate bricks, and that is only counting plates that are 64x64 and smaller. Multiply that by however many units tall the brick can be, I'll just use 15 plates which is the standard size of the wall bricks, and you've got 60,480 different bricks. You can go higher though, I've seen walls that are 90 plates high. Counting walls 90 plates high and less, between the dimensions of 1x1 and 64x64, there is a total of 362,880 possible unique rectangular bricks. And we've got window, cylinder, tree, slope, castle wall and fence bricks as well.