The sample of blue-phase liquid crystal is prepared by mixing nematic and the left-hand chiral dopant. The mixture is filled into a cell without surface treatment. We cool the sample from isotropic phase with cooling rate 2 K/min to blue phase. Initially, blue phase shows green color. As reducing the temperature, in the central area of the green lattices, the blue and red color come out. The growth process lets blue phase look like colorful bubbles. The picture is taken by a transmittance microscope with cross polarizers, and the objective lens is 10X.