Hi,
When you say 'tile colors', do you refer the background of the start screen and the tile color accents?
These settings have been moved from the usual PC settings to the new charms bar. However you have to be on the Start Screen page to access these.
a. Open Start Screen.
b. Open Charms bar (Windows key + C)
c. Click settings > Personalize
You have your backgrounds, background colors and the accent colors. Your tiles will use the background color of your application. This is specified in your Manifest in the first Tab.
Hope this information helps. Reply with the status so that we could help you further.