You can buy gradual tanners (not the brown juice to make you look orange favoured by Chavs) but I think L'Oreal do a good one and the other is by Dove. You apply it over a week or so and you are supposed to look naturally sunkissed.

Alternatively get stuck into something which gets your blood pumping and gives you that rosy cheeked look. You never know, you might find a blood pumping activity which gives you a twinkle in your eye, too...