We sampled an orange-infused iced coffee today, and people asked for the recipe:
Brew a liter (or so) of Ethiopia Yirgacheffe. You need a light citrusy coffee, others may do if you feel they have the right flavor profile. While the coffee is still hot, slice up an orange and throw the slices in the hot coffee. Sweeten the hot coffee to taste with your sweetener of choice. Refrigerate till cold, serve over ice.