Ask HN: How can a person with web dev skills make $500-$1000 per month?

Hey all,

I am a college freshman and my summer break (80 days) is coming up in a few days. Wanted to do something productive. (Couldn't get an internship).

I have the prerequisite HTML/CSS/JS + one back end lang. (Ruby + RoR) skills.

Also since I've got 80 days of free time, would it be better to invest this time in, say, getting a high score on TopCoder?