There are so many postures in yoga that help with depression and mood. Connecting with the body is an awesome way to find presence, and can help you see a way forward and out of any dark space you may find yourself in, and for whatever reason.
I find that certain poses in particular have a unique energy and mood shifting properties, my favourites being:
1. Camel pose
Backbends are heart opening and energizing. They are great if you are drowsy at work or are having a hard time waking up in the morning. Camel, Bridge, and Wheel are all great backbends, but I find Camel to be simultaneously grounding and stabilizing, as well as a huge emotional and energetic release.

2. Pigeon pose
Spending a solid two minutes in Pigeon or King Pigeon on each the right and the left side, breathing with conscious awareness the whole time, is a great way to move stuck energy and relieve tension.

3. The Bow
The Bow is a wonderful pose that helps boost energy and keep your metabolism burning strong. Bow also opens up and stretches the front of your body while strengthening your back muscles. Great for a mid afternoon pep-up when energy starts to disappear and you are thinking about a chocolate bar!
