We had a ton of fun at The Bodgery for 2017 World Create Day. Everyone brought along projects to work on and there were tons of ideas an advice flying as we got down to the hacking.
He's been working on a driver board for 32x32 RGB panels. The PCB was really interesting because he designed footprints for both an ESP8266 module and a Bluetooth module, not knowing which he ultimately wanted to use. The power supply for this board is a commodity 18650 Lithium cell with a battery holder to go along with it. This is a brilliant choice for DIY projects.
The two images above show an NES project which comes in two parts. One is a 3D printed NES cartridge enclosure that holds an edge-conntector PCB that attaches to a Raspberry Pi Zero. The second part is a PCB that will interface with the NES expansion port. When completed, the expansion port add-on will automatically detect when the Raspberry Pi catridge has been inserted, allowing the Pi to use the NES video hardware and controllers to run emulated games (or whatever else you want) without any alteration to the NES.
Bob Baddeley was hunched over the sewing machine during World Create Day. He's working on a costume set of Wacky Waving Inflatable Arm Flailing Tubemen costumes (relevant video).
The internal structure is made from those spring structures on clothing hampers. He's using fabric tablecloths for the project -- they're inexpensive, large, and come in all the colors he needs. The completed costumes have mesh for the mouth so the wearer can see out.
Sorry for the motion blur, but you can't try this on without flailing around!