A mysterious physical process that is a flash of energy in white, blue, purple tones on a dark blue background
Art of a green airplane flying in a blue sky between clouds
Cathedral and gondolas on the background of blue sky and water
A wolf , a blue sky and a forest in all its glory ????
A desert with a pattern on the sand in the form of wavy lines against a blue sky background
Green, blue and pink laboratory flasks on a dark blue background