We made a little tweak to the colors.

So, what you may have seen before is not quite the same.

Also, below is the Excel VB Sub we came up with so you can do this yourself.

Just select the cells you want to add color and run the sub (macro).

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Sub Change0to9BackColor()
    Dim InsideColor(9) As Long
    Dim SelectedRange As String
    Dim RangeRowCount, RangeColumnCount, r As Long
    SelectedRange = ActiveWindow.RangeSelection.Address
    RangeRowCount = Range(SelectedRange).Rows.Count
    RangeColumnCount = Range(SelectedRange).Columns.Count
    InsideColor(0) = RGB(255, 64, 96)
    InsideColor(1) = RGB(255, 128, 0)
    InsideColor(2) = RGB(255, 196, 64)
    InsideColor(3) = RGB(255, 255, 0)
    InsideColor(4) = RGB(0, 255, 0)
    InsideColor(5) = RGB(0, 255, 128)
    InsideColor(6) = RGB(0, 192, 255)
    InsideColor(7) = RGB(128, 128, 255)
    InsideColor(8) = RGB(192, 64, 255)
    InsideColor(9) = RGB(255, 64, 192)
    For c = 1 To RangeColumnCount
        For r = 1 To RangeRowCount
            If Int(Range(SelectedRange).Cells(r, c).Value) >= 0 And Int(Range(SelectedRange).Cells(r, c).Value) <= 9 And Range(SelectedRange).Cells(r, c) <> "" Then
               Range(SelectedRange).Cells(r, c).Interior.Color = InsideColor(Int(Range(SelectedRange).Cells(r, c).Value))
            End If
        Next r
    Next c
End Sub

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