Color Changing Flowers??

The other day my grandma told me about how if you took these white flowers (I guess it'd work with any white flowers) and stuck them in a vase with water & food coloring, that the flowers would suck up the water and they'd turn that color!
We tried it out with some blue food coloring, and they're just as blue as they can be!
We have some sitting in some red and teal food coloring as well, so hopefully those will turn out just as good!