What is the Bandanna technique? It is inspired by the typical batik style of print used on head bandannas. I think this is particularly effective if overlaid on a coloured background, and in this example I will give instructions on making a spray ink background. Of course, any type of background is suitable so try loads of ideas out. They are sure to look stunning as ATC's.
Versafine Ink (Olympic Green, Onyx Black)
Rubber Stamps (two paisley stamps from Tanda Set 1 Paisley plate)
Gelly Roll Pen (Sakura - White)
Chalk Ink (Colorbox - Lilac, Blue, and Ochre)
Cut into ATC sized pieces (3.5 x 2.5 inches) and move to the next step.