I drink a lot of different herbal infusions, I currently have nettle, dandelion, fennel, peppermint, camomile, liquorice and a blend called "Sweet Chilli" in my tea cupboard. I used to have a lot more but haven't restocked yet after our recent move. I guess rooibos (redbush) also counts as a herbal infusion as it's not actually tea, unlike green and white tea (also found in various formats in my cupboard!) which ARE tea.
My favourite though? Hard to pick one, as I drink different infusions at different times of day or to treat different conditions..... but probably liquorice. Certainly at this time of year, it's warming and comforting and I just love the taste :)
I'm normally a coffee drinker but I'm trying to switch a couple of my coffees to herbal tea - especially in the afternoon and evening. Red raspberry leaf tea is supposed to be good for breastmilk supply so I've been having that of an evening to help make night time feeds easier. So far so good!
Fennel tea would be even better for your milk supply - just buy some fennel seeds, pop a teaspoonful into a mug, pour on hot water and hey presto, you have wonderful fennel tea - much cheaper than buying it in teabags and soooo good for you too :)