Paper marbling is not only a fun DIY, but it’s also an ancient art. This artist in Istanbul, Turkey demonstrates ebru, how the floating colors can be shaped and then transferred onto paper. From TurkishCulture.org:
Ebru technique consists of sprinkling colours containing a few drops of ox-gall on to the surface of the bath sized with kitre (gum tragacanth) in a trough. By carefully laying the paper over the bath, the floating picture on top of it is readily transferred to the paper; thus, each ebru is a one of a kind print. To obtain beautiful ebru results, one needs to have a light hand, refined taste, and an open mind to the unexpected patterns forming on the water. Patience and a good knowledge of traditional culture are characteristic of ebru masters.
Related DIY: Minieco.co.uk has a great marbling tutorial.