Colouring is a great way to destress and be mindful. It also allows you to take a break and often I find that while colouring, I think better and approach problems better. It allows you to take a moment and step away from the problem. Allowing you to come back to the situation often with a fresh perspective.
Everyday Kindness Book
The everyday kindness book is a great way to start the day and help keep you focused on being kind not only to others but to yourself as your day progresses. We recommend Everyday Kindness: 365 ways to a peaceful life
Meditation App/ Music
I personally love the headspace app and if you own a smartwatch it has a great app allowing you to meditate as little as 30 seconds. Meditation is a great way to destress but also be mindful of an environment.
A plant is great and it brings a bit of nature to your desk. Now dependent on your abilities and natural light available. You can opt for a real or a fake plant. You can also get a succulent in a nice brass pot. There is something about having a little piece of nature at your desk that gets the mind into a peaceful state of being.