Design a T-Shirt

Attached is a logo for a martial arts class for whom I am printing T-Shirts. I am interested in keeping this original design for the front of the t-shirt, however, I am interested in 2 creative variations of this original logo/image that will be utilized on the back of the t-shirts. The two variations must include the double dragon image used in the original logo. I intend to use the design on both light and dark colored t-shirts. The colors that I want used are those of the original logo, which are Red, Black, and White; and the 2nd Variation is to be done in brown and purple. The company that I will be using has guidelines which outlines the acceptable formats for which the artwork must be done. I will send you those requirements if you are awarded the project. Its the typical stuff (vector art, 300 dpi resolutions, etc....).