Your team/workspace can be personalized by adding a photo to the dashboard profile. This gives your workspace more of an identity and makes it easy to identify if you are part of multiple teams/workspaces.
Sign in to your Calendar account and go to your workspace settings. It will be under the gear icon as seen in the screenshot below.
You will then go to General and click the prompt to add your workspace picture. You can see in the screenshot below where the logo has already been added.