Plant that Will Grow Soon?

I want to give a pot full of dirt and have a nice plant grow out of it. Its supposed to be a surprise so it would be best if it started growing within a week or two and wasn't especially complicated.

I'm not planning a huge garden or anything, I just want to surprise a lady friend. My previous plan was a tulip bulb but apparently they take several weeks just to take root so that's out of the question. Thanks in advance!