keep the other walls light or it will look like a cave! Try to either go with a pale shade of the teal or a safe cream/white. Pick up the teal as an accent colour with throws or cushions. If in doubt try it first - it's only paint and you can get tester pots in most colour, paint a bit on the wall with a piece of the wallpaper next to it (just blu tacked) live with it for a day or two, then decide. If you do it and hate it later - paint over it!