Rainbow Nep. I know they've done the button downs like the fruity pebbles shirt (I think there have been white, off-white, grey and brown?), but I'd love a workshirt with some crazy pops. Something with a twist of color. Rainbow nep, multi-color weft, even some sort of heathered weft like the IndigoxGrey ones with the recycled-yarn weft. ...The rainbow nep jeans are one of my favorite pairs and are so friggin comfortable.