Not a particularly unusual bit of kit in and of itself, but I'm quite happy with how this project went and others may find it useful...
I'm sure we all face the problem of keeping retro stuff to hand and playable with, but also balancing that with not living in absolute clutter. With that in mind I decided to mount my Mega Drive under my computer desk.
I made the mount from an old picture frame, some shoelaces, and some ribbon from one of those massive Hobbs bags. It ain't pretty, but then it's not for show! It plays fine. All it might need is an extension cable for the controllers, but in regular use you don't change them that often so it should be okay.
I could have just used sticky pads but I didn't like risking damaging the bottom of the console. This should work for any cartridge based system. I only actually have my Mega drive here at the moment but I may mount my 2600 Jr when I bring it up. I can't find any other examples of doing this from a quick Google, so maybe I'm a trend setter...