For fun try placing a ghost brick and then using buildwall(); buildstairs(); or two();.
Before the retail version which included macros to automate construction, there were third party building scripts that when typed in the game would build entire castles and towers. Big ugly towers and castles made out of 2x2 blocks that would usually crash the server. Build stairs is probably the only one that was ever used legitimately, and even then it spawned way more stairs then you would ever need.
You can still make building scripts but they are useless.