Changing The Cell Color

I'm trying to change a cell color depending on another cells color. This is what I have so far:

PHP

Private Sub Worksheet_Change(ByVal Target As Range)    If Target.Column = 5 Then        Customer = findit(Selection.Value, Range("L:L"))        Colour = Range(Customer).Interior.ColorIndex        If Colour = 3 Then            With Selection.Interior                .ColorIndex = 3                .Pattern = xlSolid            End With        End If    End IfEnd Sub 

findit is another function I found on the internet:

PHP

Function findit(v As Variant, r As Range) As String    findit = ""    For Each rr In r    If rr.Value = v Then    findit = rr.Address    Exit Function    End If    NextEnd Function 

Everything works, except it just wont change the cell color. I have tried loads of different ways,
Target.Interior.ColorIndex
Selection.
ActiveCell.
Range().

If I put a msgbox in the If section it shows up so everything is working, besides the color.

EDIT: im using this with data validation list if that makes a difference.