Here's how we make mono-print postcards for the Holidays.
drop some cheap acrylic paint onto a big ceramic tile
smooth into a thin layer with a brayer
draw simple designs with bold lines using Q-tips or flat end of skewer
hold your mouth just right
and hold opposite corners on the diagonal of the postcard
and bend slightly in the middle
(this is the trick for a good print)
lay on top of design from middle out
pat gently and lift!!