Idead to buildings?

Hey. I would just ask you, if you have any idead to what i could build in Minecraft? I've builded a snowball arena, Spleef arena, a house and a city. Do you have any idead to what i could build? Hospital, police station and so on? When i've builded your idead i will post screenshots of the stuff in this thread, so just post some ideas fokes!
// Spetnazz

Build a big ass castle, with walls around it and shit like that