I am in a similar situation.

I started working full time after completing undergrad a year ago, and am working on side projects more to learn than for entrepreneurship. They have been a great low cost way to continue my undergraduate math + cs education.

I certainly wouldn't mind if a project really took off and allowed me to work on it full time, but I understand that I would have to make a significant commitment (time + money) to really have any of them gain traction. Just look at http://signal.am . It is absolutely begging for someone with more UI/UX skill than I personally have -- but it has been priceless in advancing my personal skill set (outside UI/UX).