Brooklyn-based designer and artist Dave Rittinger has some brilliant ideas about shirt designs. Look at below two series: leaf series (made by various leaves and glue) and dutch boy (made by various paint samples and hot glue). These are really lovely designs which embraces ecological consciousness, illustrates how beautiful and also unpractical extremes can sometimes be. I know those designs might not last long, but anyway it is a good try to use these unexpected designs.
leaf series (made by various leaves and glue)
dutch boy (made by various paint samples and hot glue)