Shopping for something new whether its something cheap like new music or something more pricey like this ukulele I got shipped directly from Hawaii. I can only play twinkle twinkle little star but it got me through a really rough patch.
That and fresh flowers, cut or planted in the summer. The important part of this one is giving them away! I divide them up into smaller portions and give them to coworkers.
That or bringing in food to work to share. When you give stuff away it makes others or around you happy and they compliment/thanks you so that makes you happy!