Makeup sponge blending technique. Paint base color (bottom). Then paint one end of a makeup sponge with the other color. Dab at the top of the nail till the colors blend together. Finish and smooth the transition by sealing with a topcoat.
Newsprint nails. Cut squares of newsprint larger than nails. apply a base coat of polish. when nails are completely dry, soak them in alcohol, then press newsprint on nail and slowly pull off. top coat to seal.