You simply cannot have enough watercolor textures and these are really gorgeous. Their size varies, but they are all pretty big (above 1200 pixels in height and width at least).
Check them out!
Watercolor Texture #2 | Watercolor Texture #12 | Watercolor Texture #13 | Watercolor Texture #3
Looking at this collection of watercolor textures will, without a doubt, make you feel like a child again. They are big (2481×3507 pixels), gorgeous, playful and free – even for commercial use!