Annak,
A trick I sometimes employ with turkey is to lightly spray red wine vinegar 3-4 times in the last 45 minutes of cooking, which gives the turkey a lovely red brick hue. Don't overdo it, a mist does the trick.
With BBQ I oftentimes use 'tart wash' a mix of BBQ rub, cranberry juice and olive oil, which reinforces the rub flavor along with a light shine from the oil, tart/sweet and bit of color from cranberry juice.
Another 'trick', mainly used in Chinese cooking, is to drizzle meats with maltose syrup this imparts a light sweet and sticky shiny glaze.
If a pretty color is your main objective, you can use the competition BBQ trick of rubbing a bit of cherry or strawberry kool-aid on the poultry skin.
Slow smoking with wood, apple in this case, imparts a lovely burnished hue to poultry as well.