Jasmine pearls are jasmine petals mixed with green tea leaves. You might want to steer clear of them. They are, however, very impressive.
Apple is a standard base for many herbal teas. Rooibos is also a naturally caffeine-free tea leaf that bases many mixes. Are you wishing to start making your own blends? That would be far beyond my experience with herbal tea. I drink herbal tea almost exclusively. There are so many tea companies, each blending up different flavour profiles that it's easy to find something to tempt the palate. I've just placed an order with a new-to-me company with some unusual sounding blends because I was attracted by their coconut flavoured tea that turns blue when you brew it. Sounds fun! An evening favourite is a rooibos base but it tastes like caramel and there is no sweetener in it. For me, one of the real attractions of herbal tea is the ability to impart sweetness without additives.