I found the coolest thing you can do in MCPE 0.14.0! You can dye water in cauldrons. But the colours you can create are not just limited to the single colours the dyes in the creative inventory provides, but you can mix them to create new colours! This is extremely useful for making mosaics and decorative stuff. I think there are over 40 colour combinations you can make.
Here is a screenshot of what I've done to decorate the flooring of a building:
Feel free to share this piece of information with your friends!