Colouring In Poster Under The Sea Rachel Ellen Designs. Colouring posters for hours of fun and mindfulness! Printed on a sturdy material in a 1000mm x 700mm size, these are large enough to be worked on by more than one child at a time, whether on the floor, on the back of a door or on a table, they could even be used as table cloth afterwards! Packaged folded in a neat, cardboard wallet with Euro hook. This design features an under the sea theme.