Flowers can look good in black and white, it just depends on the flower and the angel of the photo. You can also put a photo into photoshop and gray scale it or something to see what it looks like black and white. I don't have photoshop installed right now but i personally like A Rose in the Dark, On the Rocks, and i think When it rains might look really good black and white. You might want to look first in photoshop tho