By hybrid, I think you mean flavored teas. Flavoring can be roughly divided in two categories: artificial and traditional.
Artificial flavoring includes use of different kinds of extracts, such as oils, and other kinds of flavoring agents. I'm not a big fan of this type of flavoring. It's often used to mask the taste of low quality tea leaves, and the tea is often so strongly flavored that you can't even taste the tea at all. Artificial flavors, especially the cheaper ones, tend to have one dimensional taste. They can have good strong taste and scent, but you might get bored of the taste quickly.
Traditional means the use of traditional flavoring methods. This can mean mixing some actual plant parts, like flowers or fruits, with the tea leaves. Tea leaves can also be dried in containers that give flavor to the tea leaves. This type of flavoring gives more complex taste and the flavoring is often used to enhance, not replace, the taste of the tea leaves. Rose buds, for example, are commonly used in flavored teas. Genmaicha is traditional Japanese green tea which is flavored with roasted rice. There are also stuffed tangerine tea, which are made by stuffing empty tangerine shells full of tea leaves and then drying them.
And then there are tisanes, sometimes called herbal infusions or herbal teas. Tisanes doesn't contain any tea, or any other caffeine containing plants. They are nice option if you want some caffeine-free hot drink.