My latest creation

[throbscottle]

Ok so it's a switch. It's quite a nifty switch though
https://www.instructables.com/id/Latching-Momentary-Switch-for-ATX-PSU-Conversion/

 

[dr pepper]

I've wondered about making a flip flop with a 555 a couple of times, obviously it can be done.
I think you need some more terminals on that panel.

 

[throbscottle]

I'd actually drilled pilot holes for them!