First up you should head to the windows store to download the latest Windows Terminal
Once installed open your new Windows Terminal and head straight to Settings
This is going to open a .json file with the configuration settings, when you first install you will not see this block of configuration under defaults but this is what gives you the ability to add a background image / logo to your terminal session.
The code is following, this will enable this same theme (image) over PowerShell, Command Prompt and Azure Cloud Shell.
// Put settings here that you want to apply to all profiles.
“backgroundImage” : “C:\\Users\\micha\\AppData\\Local\\Packages\\Microsoft.WindowsTerminal_8wekyb3d8bbwe\\RoamingState\\black-on-green.png”,
“backgroundImageOpacity” : 0.75,
“backgroundImageStretchMode” : “fill”
If you then want to customise the colour scheme scroll down in this .json file a little further until you see these blocks of configuration.
You will see in the PowerShell top block I have selected the One-Half Dark colour scheme.
You can find the default ones here that are available.
This takes 5 minutes to install and get custom.