If you're vegan, the only reason to come to Culture Organic is for the donuts. Culture carries Pepples vegan donuts here and sells them for $2 a piece (which, amazingly, is $1 less than what Pepples itself charges at its kiosk in the San Francisco Ferry Building).
Otherwise, Culture has no vegan yogurts, no sorbet and nothing else of note. They do carry loose-leaf tea, to their credit.
If Culture had a vegan yogurt I'd be here all the time. If you are looking for vegan fro-yo, look no further than Fraiche in downtown Palo Alto, which features customizable soy yogurt. But no donuts.