Adding an image as an overlay to an existing image

Hi All,

One of my customers is looking towards adding a branded screen saver to their fleet. I have their corporate logo as a PNG with transparency.

Rather than working with a fixed set of static images that we would have added the PNG to ahead of time... I had the idea to suck down Microsoft's spotlight images, add the overlay to those, and then use the modified image/s as a part of the standard Windows slideshow screensaver. Thus the screen savers dynamically change day to day and always feel fresh and new.

Pretty sure I am across what I need to do to access the source images, but where I am stuck on is adding the corporate logo to these images.

Found a number of examples online of how to use powershell to add a text based overlay/watermark... But nothing on how to insert one image into another.

Is it possible to accomplish this in powershell? To add one image to a specified position on another image?
If it is possible would the transparency of the logo be maintained or would it be replaced with white space?
Or would this require the use of third party tools?