I kind of like the basic flowers more than hybrids in general, but I do like pink roses too. I think the orange-red pansies are pretty too, but they don't really match my town and I'm not sure where to put them lol. Other hybrids look a little too unnatural to me.
I really like the black tulips. And the black lillies. Not so much the roses, but they're fine. I haven't been able to grow black cosmos yet. I wonder if I'm doing it wrong...
EDIT: Yes, I've been doing it wrong I've been pairing red + red, when I need orange + red or orange + orange, according to Thonky.