Mark or highlight certain cells

Hi,
In Excel 2010 I press F5 key and then select Go To , then Special and then I select Formula. When I press the OK button all cells with formulas are shown in blue color.
How can I keep these cells highlighted ?
I need to do this so that when I return to the file latter I would easily find these cells.
Can this be done to all my sheets in the work book taking into consideration that the sheets are protected.

Will the same process work in Excel 2013 and latter version?

Khalil Handal

Once you goto special - formula and the cells are highlighted go to the home tab and choose fill (and a color)