I've been working in the industry for nearly 10 years, and before that I'd been programming for another 10 years. A lot of my skill I attribute to having worked on side projects - nothing has really been successful, but working on side projects allowed me to learn new things and explore new ways of working. And most of all, I found it a pretty fun way to spend spare time.
That was up until a year or two ago. Three years ago I got married, and so my spare time has been reduced, but even when I have spare time now, I feel really unmotivated to work on side projects. I'd rather play computer games or watch TV (by myself, not necessarily with my SO, in case you thought that might be why).
I'm getting rather frustrated by it, as there are lots of new technologies and things I'd like to try. I even have a side project that has been mildly successful with a few paying customers, and with more effort I believe it could provide a substantial amount of my income. Other ideas I have are projects that won't necessarily make money, but are useful enough that I could justify the time spent building them.
But alas, I just don't feel motivated to work on any side projects outside of work. Over the last two years I've gone from working remotely pretty stress free, to working in an office with a lot of stress and overtime, and back to working remotely, so it's not an issue with my day job taking all my energy.
Any ideas?
That said, you could also try to find interesting things you actually are interested in working on. Building yet another demo website- boring. Building some sort of useful tool or home tech project- cool. At least, that's what works for me.