The general idea is pretty cool. The main question is probably what the images should link to and what images to use for contributions that don't have a dedicated page (just github). I think the default link should be to the code but links to videos or overview pages are also fine.
I think the idea is generally a good one, people can post cool stuff they work on and it can even be a good source of inspiration for non-programmers or people only loosely interested (I'm thinking of journalists, teachers, parents and curious youngsters answering the question "what cool stuff can be done with technology").
Could also have some job market/finding employees implications (maybe a possible monetization route?).
I think the idea is generally a good one, people can post cool stuff they work on and it can even be a good source of inspiration for non-programmers or people only loosely interested (I'm thinking of journalists, teachers, parents and curious youngsters answering the question "what cool stuff can be done with technology"). Could also have some job market/finding employees implications (maybe a possible monetization route?).