I have a portable laptop- I usually just set up shop in the nearest chair. I'm looking into getting an actually nice chair in the interests of having better posture- if anyone has any suggestions that are worth my Dollars, let me know
My actual desk is currently home to a (midi) keyboard, a lamp, my raspberry pi's (mounted to the side, with a little button on the top of the desk that restarts them), my calculators, and a 3d printer (as well as assorted 3d printing paraphernalia, like clippers, carefully enumerated parts from my latest printing project, and a suprising number of little plastic strings). There's too much personally identifying stuff on it right now for a picture, but I have occasionally sent pictures of it in Discord/IRC.
While I'm sure there's some preening going on here, I'm actually fairly impressed with how organized everyone's desks are. I like having a thin layer of the things I need spread out across my desk, generally sacrificing organization for ease of identification, access, and storage. As you can imagine, I'm bundles of fun to live with