As long as you’re dealing with a drinker, you really can’t go wrong with a liquor present. (And nondrinkers probably have tons of time for laundry and magazines, so in that case see above.)
A variation on the simple heart design, the tulip has become a favorite not only in latte-art competitions (yes, that’s a real thing), but also as an elegant flourish atop cappuccinos, in which it’s often difficult to pour a more delicate rosetta.