That would be a really neat thing to do! What specifically would you do to help them go to college if you could? Is there anything along that lines you could do with the educational background you have? Once I volunteered to tutor reading to children that needed extra help with that. It was pretty relaxed, just like once or twice a week, but felt good to help out.
When I am at my worst mentally, I have found volunteering really can help me get out of that. It helps me to have that sense of purpose and focus on it.