Found this from an old post...maybe you can improvise with ribbon? =) YouTube - Basic Tsumami Kanzashi Tutorial (improved n...n)
p/s: supplies and whats needed is in the youtube link too... =)
p/p/s: from the old post, i also read that someone used a 1.5" ribbon and cut about 1.5". So, about 1.5" x 1.5" square?