hibiscus tea is very good. I think the bright, almost berry like flavor would be interesting in a saison. You could always make a concentrated tea and added it to taste or to the right color.
Hmm I might have to try this.
Planning:Choke cherry wine, brown ale.
Bulk Aging: Oud bruin with elderberries, Brett Saison, ordinary bitter.
Bottled: Oud Bruin, cider, black raspberry mead, Elderberry wine.