This could get interesting and creative for sure!
1. Nitro- Touch up the current blue and yellow but make the rails a deep orange.
2. Batman The Ride- Make it black again!
3. Giant Wheel- A nice brilliant white.
4. Skyride Towers- Make them green again to blend with the trees.
5. Great American Scream Machine- Same colors, how could you possibly change this? Maybe make the support structures alternate blue and white.
6. Kingda Ka- I'd put the alternating blue and green that's on the launch track on the return track too, going from the bottom of the tower to the station.
7. Rolling Thunder- Fresh white, with bright yellow railings.
8. Medusa- Make the track a distinguishable bright green (Not yellow!) and redo the supports with the bright purple they used to be.
9. Parachute Tower- Some kind of pattern with red, white and blue, kind of pairing it with GASM. Maybe make the tower blue with white stars and the top red.
10. Carousel Horses- Redo whatever colors they are now/originally were.