I don't have side projects. I don't really want one. What I do is satisfy my intellectual curiosity. I've always been very curious how things work. If I see an app with a widget that does something, I will (try to) recreate it. I'll then move on to the next curiosity. I like protocols, so maybe I'll implement a minimalist IRC server. Then move on. I don't fully flesh out these applications. I do the minimum I need to understand and learn and satisfy myself and then move on. I am curious about so many things, I don't have time to have a side project.
Another thing is, I love reading code, so if I see an Open Source project that does something really interesting, I'll read the code. If there's a particularly tricky piece of code, I'll print it out, grab a sharp pencil and go sit on the back porch to trace through it and understand it.
I don't do side projects. I don't have a github account. But I do code a lot. And I do read a lot of code.