Usually I tape the paper or card down to the table, and squeeze some paint directly onto it. This time I squeezed it onto a plate and let him dip into it - this gave my son a tiny bit more freedom to experiment with colours.
First we tried a mini bath pouf and scourer.
He couldn't resist getting his fingers involved to mess up all the textures though!
Then we used the hard-bristled scrubber, also with a useful handle.
Another day we experimented with sponges. We used a bigger piece of paper, and some cut up sponge shapes. This went pretty well although F did insist on making a sponge tower from all the pieces!