mojo - I agree 100%. Changing the look and feel of your charts can affect your decision making easily. If nothing else, your brain is trying to decipher the new look and for some (myself included) that can cause disruptions. My candle charts are blue and red candles. Why? Well, blue is my fave color and red is standard bearish candles. Red and blue work well together in my opinion. I've had it that way since I can remember. Going back to green and red would just be 'weird' to me.
I'll add this as well - in addition to the coloring of your charts, the size of the candles, the length of the X and Y axis, etc. can also produce different pictures for me, even though it's the same info! I've actually found that having large monitors can HURT my view and trading b/c everything looks so exaggerated. And then when I see that it's just a 3 tick candle, things change.
This is actually important, esp for newbies to trading, to understand. How your charts look and are setup can impact your trading, whether you are conscious of this or not.
Here's a quick example:
ES CHART #1 (15 MIN CHART)
ES CHART #2 (SAME 15 MIN CHART)
Believe it or not, those are IDENTICAL charts, just different Y axis.