I found an interesting tool which I've been using to show current cryptocurrency values. It is called Cryptop. It is a Python app which shows current values for a cryptocurrency portfolio.
See it's git repo for the detail on how to install and run.
If you want the green screen shown in the instructions edit the config.ini in .crypto directory which is created after you first run the app. Change the default values to the following.
[theme]
text=green
banner=green
banner_text=black
background=black