Ken Boll created 2 different FDC cachet designs for
'The World United Aganist Malaria' campaign issues for the United States and the United Nations.
One on the cachets is focused on Gorgas and the other has a main image of a Caduceus.
Below are the known colors of the cachets.
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Ken Boll Cachet (Red/Black) 
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Ken Boll Cachet (Blue/Black) 
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Ken Boll Cachet (Black) 
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Ken Boll Cachet (Orange) 
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Ken Boll Cachet (Brown/Orange) 
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Ken Boll Cachet (Green) 
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Ken Boll Cachet (Blue/Green) 
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Below are examples of FDCs with the Ken Boll cachets. There are a few different cancellations on the FDCs.
If readers have different colors for the cachets of different stamps on the FDCs, please email me at malariastamps@yahoo.com.