All I did to make this brush was sketch a few designs out and then decide on color scheme.
Here's when I took out my sharpies and a scrap paper for brain storming color combination. A few things didn't add up, so I went around the paper and did color in sections to figure out what sequence I wanted to pull together. Then I decided which ones looked best together and drew arrows and lines to pull together the final set up.
Last step was to use a circle stencil and draw the designs on my brush handle. Then I went in with my sharpies, and there you have it, my own personal Bionicle themed bath brush. :P