Essentially any tea can be made into an iced tea. It is a matter of personal preference to what tea you like iced.
Most people prefer fruitier tea for iced tea, so Hibiscus, Berry Fairy and Luvberries are pretty nice choices.
If you are more keen on the "southern US" style of iced tea, then any plain black tea can do the trick, but we would recommend Ceylon Classic OP for its clarity and aroma, or lower tannin Chinese blacks such as Keemun.
Your taste buds need to work hard to taste things cold, dso ouble the strength of tea.