If you have a list of the GPS data of what you want to build, you can simply create or edit a file in poiedit.
Once you have that done you have like a wallmart.ov2 file which can then be copied into your map directory.
All you need now is 22 by 22 pixel logo, so get little creative with that in a good paint & photo program like photoshop.
Google Earth can be used in combination with Google-TomTom, although I wonder if it's really accurate.
Google-TomTom can be downloaded from http://www.janboersma.nl/gett/index.php
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