Life is stressful! If the person you're shopping for is anxious all the time, you might as well help them out with a gift that will let them chill out, if but for a little while.
Sound Isolating Headphones: The first step to relaxing is cutting yourself off from the irritating, irritating world around you. The Shure SE115m+ earbuds are a great choice for iPhone-owners, as they pair quality sound isolation with a mic and three-button remote. $120 [Shure SE115m+ via Link]