What brand of paint do you use? Do you clear coat after sponging? Those look great.
Rust-Oleum and Krylon. I just spray a little puddle onto a piece of shiny cardboard(like a cereal box) then dip natural sponge pieces into it for the pattern. I do use a satin clear coat. I don't really like the flat clear coat, as it almost looks gray. Use the satin, then take the shine off with some 000 steel wool, after the clear has fully cured.
