I made a gigantic staircase, high enough that the ground disappeared,
admin cammed to the top,
disabled raycasting on a crapload of the bricks,
did a console command to get my camera perfectly centred over the top of the stairs,
took a screenshot,
opened paint.net,
deleted sky,
cropped to stairs,
made the brick texture more obvious,
then resized it to 75x75.
Basically its a big frickin staircase.