With a little help from Theo, I was able create a function to convert colors in hex format to a value that would work in Excel.
Function ConvertRGB(hexcolor As String) As Long
Dim r As Long, g As Long, b As Long
On Error Goto Errorproc
r = Clng("&H" & Left(hexcolor, 2))
g = Clng("&H" & Right(Left(hexcolor, 4), 2)) * 256
b = Clng("&H" & Right(hexcolor, 2)) * 256 * 256
ConvertRGB = r + g + b
ConvertRGB = 0
This function can work on values from Notes Color fields also. Just be sure to pass the last 6 characters of the value in the field. This was the last piece of the puzzle I needed to get working before I could release my next version of the ASND Export Facility.