THIS IS SO EASY, Y'ALL. I can't stress that enough. All you need to do is:
1) Pick a quote you want to use.
2) Sketch out the quote on a piece of watercolor paper in pencil.
3) Paint over it in watercolor.
4) Erase the pencil.
This one's a little hard to read, but it says, "And above all, watch with glittering eyes the world around you." Roald Dahl wins again. For this one, I wrote the quote first in white crayon (which is a little scary because you can't see it at ALL), then just painted over with watercolor.