You could use this function as well. I used all of Excels standard
colors, you could eliminate those you dont need. Also, the function
does not automatically update when you change a cell background as that
is a formatting change. You will need to recaculate teh worksheet.

Function CountColor(myColorName As String, myRange As Range) As Integer

Dim myColorIndex As Integer

Select Case myColorName
Case "Black"
myColorIndex = 1
Case "Dark Red"
myColorIndex = 9
Case "Red"
myColorIndex = 3
Case "Pink"
myColorIndex = 7
Case "Rose"
myColorIndex = 38
Case "Brown"
myColorIndex = 53
Case "Orange"
myColorIndex = 46
Case "Light Orange"
myColorIndex = 45
Case "Gold"
myColorIndex = 44
Case "Tan"
myColorIndex = 40
Case "Olive Green"
myColorIndex = 52
Case "Dark Yellow"
myColorIndex = 12
Case "Lime"
myColorIndex = 43
Case "Yellow"
myColorIndex = 6
Case "Light Yellow"
myColorIndex = 36
Case "Dark Green"
myColorIndex = 51
Case "Green"
myColorIndex = 10
Case "Sea Green"
myColorIndex = 50
Case "Bright Green"
myColorIndex = 4
Case "Light Green"
myColorIndex = 35
Case "Dark Teal"
myColorIndex = 49
Case "Teal"
myColorIndex = 14
Case "Aqua"
myColorIndex = 42
Case "Turquiose"
myColorIndex = 8
Case "Light Turquoise"
myColorIndex = 34
Case "Dark Blue"
myColorIndex = 11
Case "Blue"
myColorIndex = 5
Case "Light Blue"
myColorIndex = 41
Case "Sky Blue"
myColorIndex = 33
Case "Pale Blue"
myColorIndex = 37
Case "Indigo"
myColorIndex = 55
Case "Blue-Gray"
myColorIndex = 47
Case "Violet"
myColorIndex = 13
Case "Plum"
myColorIndex = 54
Case "Lavender"
myColorIndex = 39
Case "Gray-80%"
myColorIndex = 56
Case "Gray-50%"
myColorIndex = 16
Case "Gray-40%"
myColorIndex = 48
Case "Gray-25%"
myColorIndex = 15
Case "White"
myColorIndex = 2
Case Else
myColorIndex = -4142
End Select

For Each mycell In myRange
If mycell.Interior.ColorIndex = myColorIndex Then CountColor =
CountColor + 1
Next mycell

End Function