Have you checked out the two '50 jobs that make 50k without a college degree' posts on the front page? Those carry a lot of good ideas.
I've got some friends who have made money on the side through wedding photography and freelance writing. Both unstable, but if you can make a name for yourself, you can go far. Of course, you could also say the same about blogging.
Good on you for working to build a house from the ground up!