To answer the original poster...the folders for ObjectDock in "My Documents" can just be deleted. Basically they were created for use with the .dockzip format which would autoinstall everything from backgrounds to tiles. But very few people including myself do not use the .dockzip format because I as well as others don't want these extra folders in "My Documents."
The original location for the backgrounds..tiles and side docks is in C://Programs/Stardock/ObjectDock/backgrounds. Everything can be placed in there and work just fine. Another reason for keeping them there is so you get full use of custom Plus/Minus images that are used with tabbed docks.