Coloured candles

I am looking for an indicator that will perform the following :-

1) On the 1 hour chart Calculate ((High Price + Low Price)/2) -  ( (Open price + Close price)/2)

2) This value should now be compared to the current spread value. If this value is greater than the current spread value then the 1 hour candle that this expression is true for should then be coloured in say default 

     yellow. I appreciate that this is the tricky bit as you must allow for the different decimal places on the various currency pairs.

2) The candle or candles that this relates to should remain coloured for as long as the expression remains true.

3)  It must do the above for each candle from a given G.M.T. time until cancelled i.e. 01.00 hours, 08.00 hrs, etc

The thinking behind the indicator is that after I have loaded the 1 hour charts (say at London opening) I quickly want to flick through them and have this very visual representation that shows the prior candles that the above expression is currently true for.