I use vundle now and found the following to be the easiest way to change your color scheme
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
Plugin 'flazz/vim-colorschemes'
call vundle#end()
colorscheme molokai
You of course need to open vim and run :PluginInstall
And here is a preview of the schemes so you can pick your favorite