I started with a single cube, and limited myself to push pull, inset, gumball extrude and move, and split face with curves. (used the new auto cplanes as well)
was pleasantly surprised how far I could go without any other tools at all. this was about 20 min of messing around with no preconceived plan or design… I just mashed stuff around until I found something I liked.
( no, I’m not an architect, nor do I have any resemblance to one)