Emacs can be customized in several ways in addition to the standard customization buffers and the Options menu.
The Font Panel may be accessed with M-x ns-popup-font-panel. It will set the default font in the frame most recently used or clicked on.
You can bring up a color panel with M-x ns-popup-color-panel. and drag the color you want over the emacs face you want to change. Normal dragging will alter the foreground color. Shift dragging will alter the background color.
Useful in this context is the listing of all faces obtained by <M-x>
list-faces-display.
The default behaviour when a user drags files from another application
into an Emacs frame is to insert the contents of all the dragged files
into the current buffer. To remap the ns-drag-file event to
open the dragged files in the current frame use the following line:
(define-key global-map [ns-drag-file] 'ns-find-file)