Tsutsugaki (筒描 is a Japanese term for the practice of drawing designs in rice paste on cloth, dyeing the cloth, and then washing the paste off.
The rice paste is typically made from sweet rice, which has a high starch content and is therefore rather sticky. The paste is applied through a tube (the tsutsu) similar to the tubes which are used by bakers to decorate cakes. A related process is to apply the paste through a stencil; that is called katazome.
The cloth is typically cotton, and the dye is typically indigo, so the design is usually white on blue. Banners for shops or other purposes are sometimes made in this manner.
The designs are often creatures from Japanese mythology such as the crane or the tortoise, or a family crest, or a name (written in kanji). Flowers and trees are common motifs as well.