The abstract stamps really don't have much to do with the name in any special way and if they stood alone, don't suggest any relationship to the name of the agency. While I like #78, for example, it is a reach when it comes to association.
#70 looks like a version that has already been done by flatworld.
#69, #61 & #62 have shaddows that are tough to recreate with stich work.
Of all, #78 is the only one I would consider.