the 4th one down is Des Plaines. those are 3 sets of train tracks crossing in the infamous "DeVal crossing."
and the last one has my house and school in it!!!!! look at he field track in the top right of the last picture, thats my High School, i live right behind that. the mall is WoodField mall.
That's a rainbow, around the shadow (on a cloud) of the plane the picture was taken from. On the ground, we only see part of a rainbow, but in the air, looking down with the sun behind you, they're often round, and sometimes appear quite small. I've seen a few of those, but never got a picture... good one!