I think I treated Lego instruction books a bit as my bible. Thou shalt built this, at least once. Most of my creativity was in composition: I would built a city out of all those more or less built-to-instruction sets, and would overhaul said city every few months or so. Road plates would have sidewalks, roads with directions, that I would type and print on a computer, rail, preferable with a higher bridge somewhere every time. Once the whole city was built up and complete (no space left empty), I'd take it all away and compose a new city.