Absolutely. I come up with a lot of crappy ideas, but there's usually something worth exploring every now and then.

(1) I have an asana project called Ideas. Each task is an idea. I've set up a workflow where I can just send an email to the Asana project inbox and a task gets created. I've kept up this practice for more than a year and I have almost 300 ideas I've logged.

(2) Whenever I think 'alright, I want to work on a new side project', I go through the list of ideas and categorize them. A ton get categorized as trash, and a very small number get categorized as worth moving into customer discovery and validation.