Usually they just come to you or find you on their own. You do keep an eye/ear out for them so you notice when opportunity knocks. For me it is usually someth

Usually they just come to you or find you on their own. You do keep an eye/ear out for them so you notice when opportunity knocks. For me it is usually something I need or a client needs to automate, or something where a web app could do it better than how it's currently being done. I keep a list of ideas/possible projects and then focus on creating the ones that are the most interesting have the most potential. You have to watch out for shiny things, next thing you know you are jumping from one project to the next. Which is ok sometimes if you just want to learn something new or explore. Usually you'll have one idea that has the most potential to be something that generates revenue so focus on that one if that's your goal till you determine if it's viable. If you don't listen already you should check out StartUpsForTheRestOfuS.com, listen from episode 1 of their podcast in their archives.