Here’s a product idea: Tinkertoys for adults. Not “adult” as in XXX, but adult as in made of stainless steel or aluminum instead of wood (or plastic.)
The kit would include square flat panels made of glass or wood so you could build yourself a coffee table, end table, bookshelf, etc out of them. A square coffee table, rectanglar, t-shaped, whatever you wanted.
There isn’t an IKEA close by, but we have one up at Potomac Mills near DC. Do they have something like that? All I saw on their site was a sort of modular shelf system, which is sort of neat but not as neat as shiny metal Tinkertoys.
Oh, heck, we had this over thirty years ago when I was an undergrad. It was called “slotted angle iron”, although it was colloquially “Dexion”, after one company that made it. More like a giant-sized Erector Set that you could use to build items tens of feet long. The Theater groups on campus used it for building sturdy stages and sets, and the labs used it for making rigid experimental structures. People made furniture out of it, too, attaching plywood panels to the sides. http://www.lkgoodwin.com/cgi-bin/quikstore.cgi?category=Slotted_Angle&OVRAW=Slotted%20angle%20iron&OVKEY=slotted%20angle%20iron&OVMTC=standard