I am not sure what you did so far, but it is possible to have a different graphic image associated with each style of an object type.
Way back when graphic properties were a new feature, I did a quick experiment and managed to get different door styles to show different graphic properties in a Schedule Table.
http://architects-desktop.blogspot.com/2006/03/enhanced-property-data-fea_114297507692451112.html
I am not certain what you mean when you say "I can not find a way to have it bring in the block for the different wall types." Do you not have a separate Wall Style for each type? If you are using a variable-width style, then I do not know of a way to show a different block based on the width of a specific Wall instance.
David Koch
AutoCAD Architecture and Revit User
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