Here is a variant I stumbled upon one evening when we were all out of grenadine: the Chocolate Tequila Sunrise. Just use chocolate syrup instead of the grenadine - but make sure that it is warm or it won't dissolve right. It tastes a little like one of those Terry's Chocolate Orange things, only with less sugar and more drunken stupor.
Since its invention, I have also occasionally called it the Tequila Smogrise, or the Los Angeles Tequila Sunrise.