Anyway, does anyone have a good idea for a non-profit organization which would be interesting and possible to start with $1500? Also funny non-profits will due too.
Pay it forward type 3rd world charities are pretty simple to start for fairly cheap and can expand pretty rapidly and can sustain themselves on a pretty small amount of money because the products they donate come from people that were formerly donated to. The only problem is that those aren't really "new" (see: Heifer Project).
Also in the third world, something dealing with a sustainable safe water supply would probably do well.
On a local level it's more difficult because problems in the first world seem to be very localized at their roots. For example, unemployment/homelessness is a problem, but that problem has a different cause and solution in Detroit vs. New York; in contrast to safe water where the problem is that there isn't any safe water and the root cause is just that.
What about an NPO that helps expedite immigration? You could start that up pretty cheaply as it's really just consulting with people.