I'm digging this idea out from the dead! If you weren't around for these, the idea is pretty simple. Find the weirest, awesomest, or just simply practical phone related things you can from eBay, and paste them in; if you like it, it's probably worth sharing. I'll start.
Bell System Operator's Headset
Point to Point T1 radio. Because...well, why not? Make your own black routes!
Point to Point HDSL/T1 modem. Also why not?
I was planning on posting a super cheap Definity PBX I saw yesterday, but it looks like somebody snagged it. So here's something, well, maybe, kinda sorta possibly as good...ish. An exotic, "Program Control Telephone Exchanger" from the far east .
15A Announcement Machine (like the kind 5ESSes use)