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In column types like Address, LatLong, XY we can add an Optional Url for KML File.
This can be used also for Screen Overlay. You know the Google Logo in Map View: This is a Screen Overlay.
So why donโt use your own Logo? 
(Note: No, we can NOT overlap the Google Logo with our own branding 
)
Screen Overlay is an Image that will not move, when you move the map.
At first here are some Documentations:
Screen Overlay
KML Tutorial
KML Reference
We can do funny things:
Logo / Info / Legend
Animated GIF
We can even use a Google Drawing as the Image Source.
This means: If you change the Google Drawing, it will change the KML Screen Overlay.
(This is not working with Animated GIF)
The KML File should look like this:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<ScreenOverlay>
<name>My_Screen_Overlay</name>
<Icon>
<href>URL_To_The_Image</href>
</Icon>
<overlayXY x="0" y="1" xunits="fraction" yunits="fraction"/>
<screenXY x="0" y="1" xunits="fraction" yunits="fraction"/>
<rotationXY x="0" y="0" xunits="fraction" yunits="fraction"/>
<size x="200" y="200" xunits="pixels" yunits="pixels"/>
</ScreenOverlay>
</kml>
Please read the Documentation above to learn more about overlayXY, screenXY, rotationXY and size.
You can download also a KML Samples File to study.
Here is a Demo Video:
