Sorry to hear of the tough times hopefully they get better soon. Coming from the perspective of a poor college student, I suggest some kind of art (photography, drawing, etc....as suggested above), also it may cost slightly more for the initial investment but learning an instrument is very time consuming and very rewarding. I would suggest guitar/bass, you can find one new or used for very reasonable prices (<$100 in some cases) and through the use of the internet or a couple of beginner books you can teach yourself for free.
2011 Synergy Green Metallic 1SS Camaro:
RS Package, White Ralley Stripes, Premium Sound.
Mods; Flowmaster Exhaust, Vararam CAI, Pfadt Sport Suspension, Budnik "Ice" Wheels, Nitto Invo tires
Upcoming Mods; Custom grill and badging.