I actually find that the colorful screen is distracting to me. I've organized my tiles such that when I'm scrolled to the top of my start screen, all the tiles there have the accent color (with exception of the People tile). Fortunately, all the apps I use most (and that provide me useful live information) are in the accent color:
1. Calendar
2. People, Phone
3. Messaging, Linked Inboxes
4. IE, VM Lite (a voice memo app)
I do agree however that if a particular service, website or app has a well established color scheme (e.g. netflix, facebook, office, etc.) I would prefer that color scheme be used over the accent color, but I would probably move the tile out of the first four rows.