I've got a lot of half-finished side projects that I tinker with and the thing that got me to get them to a usable state was creating a website - I'd had a personal domain for a long time and I decided to put a simple site on it (some information about me and my work etc). I realised quickly that I didn't want to show off half-finished projects so it very quickly motivated me to polish some of my projects and get them across the line.