On my tutorials about Ubuntu you have seen “Terminal Windows” Transparent. Here is a short guide how to make the Terminal transparent or add Image on background.
Open the “Terminal Window” and go to Edit>Current Profile:
On the Window Profile select Effects tab:
Check the radio box “Transparent background” and move the slider to give more or less transparency.
From this Tab you can add also a Image for Terminal background.
Check “Background image” box and find a img from “Image file“:
Also here you can play with transparency slider to make the background more visual or colored.