Marbling is a method of liquid surface design that can produce patterns that bring to mind smooth marble or other stone. Coloured mediums, such as paint or ink, are floated on either plain water or a viscous solution known as size, and then carefully transferred to an absorbent surface, such as paper or fabric. Usually the floating colours are manipulated either by blowing on them directly through a small straw, fanning them or by stirring them with a stick or brush.
A fun and simple way of achieving a marbled background is to use shaving foam to float the colour. Pieces of cardstock or paper are easily laid over the swirled colours and then removed to reveal the pattern. You can find a full tutorial on shaving cream marbling right HERE.