Whomever your art teacher was should have been fired. You don't want to limit yourself, you just need to use the right colors to help accent elements that are important and dull out stuff that isn't important. For future reference use this website http://colorschemedesigner.com/ to pick your colors next time (Use the accented analogic option) You can change the color angle if you don't want that much of a contrast between the light and dark elements.
GG RIP PSD
GG RIP PSD