Si people have a knack for nice organization, but I’m not sure they’re particularly inclined toward it. I’ll echo your experience of Si people having hoarding tendencies.
As for me, I’m not posting my room because there isn’t much to show: just an unmade bed, some cables and a pillow on the floor, and maybe some clothes I haven’t kicked into the closet yet. I’d probably be messier if I owned more.
My desk has some empty water glasses, papers and pencils strewn across it, and a half-eaten corn chip bag. I’m not sure if that’s interesting to see, but since everyone else is doing it I might take a picture tomorrow.