can you put colored contacts over regular contacts?

NO! Contact lenses are not manufactured for layering, severe damage to your eyes and cornea scratching may occur that may result in serious infections.

If you require a prescription there are many colored, theatrical and Halloween contacts available with a Power (prescription).

For your safety, consult a licensed optometrist for proper lens use and care.

Other Answer:

Do not do this. One contact on top of another can alter the fit of the prescription lens and will diminish how much oxygen your cornea receives.