Love it. I've always felt like my github wall was misleadingly sparse (since the vast majority of my work is in private repos). This is a nice way to add some flavor.
Debate could be had as to whether you should be allowed to modify your GitHub history like this. Personally, I think its a good thing.
I had similar thoughts when creating this, but in the end I felt like it would promote using GitHub as a place where you keep your toolboox / have fun - and less a place where recruiters will blindly look at your "streak" count to decide whether you are a good developer or not.
Keeping bad recruiters away from our GitHub accounts one picture at a time.