VBA would do it
Public Sub Test()
Dim cell As Range
For Each cell In ActiveSheet.UsedRange
If cell.HasFormula Then
If InStr(cell.Formula, "INDIRECT") > 0 Then
cell.Interior.ColorIndex = 38
End If
End If
Next cell
End Sub

Signature
HTH
Bob
(there's no email, no snail mail, but somewhere should be gmail in my addy)
> Is there a way to use conditional formatting in such a way so I can
> highlight
> cells that use a particular formula?
> For example, my spreadsheet uses a lot of INDIRECT() formulas in different
> variations, but I would like to highlight them all.
> Thanks in advance.