My favorite colors are Orange and black As anything else... some sort of symbol like these I found, otherwise you can be creative :) https://www.wordans.com/custom-t-shirt-design-details/sci-fi-fantasy-design-ultron-275769 http://vignette4.wikia.nocookie.net/marvelanimated/images/d/d8/Ultron_Intro_NAHT.jpg/revision/latest?cb=20100228055732 I'm excited to see it :)