Click the green flag to edit the texture. Click/click and drag to draw the texture. Change the color and brightness with the sliders in the top left. Press R to reset the texture to a solid color of the current color and brightness. Press Space to begin the distortion. Drag the gray circles around to distort the texture. Press the green flag again to make further changes to the texture and reset the vertices.
All code is completely mine, it's just a fun demonstration project that I might expand later.