Is there a way to make a result of 7 of the d20 die show up as a special color when one of my players roll? And can I assign the same concept for other players on a special number on d100?

So in Star Wars 5e there is a subclass that is all about luck, thus rolling a 7 on d20 for skills or attacks causes special effects. I would like it if that character when he rolls and gets a 7 to have a special color the way that a 1 or 20 on a d20 have special colors. Is that possible? If it is, is there also a way to assign each of the players a special number when they roll a specific number on d100? We have always let players have a special number when rolling for random events so each person has their own special number that cause something interesting or cool to happen even if it isnt a success. 

Yes, but it will have to be red, green, or blue. Note that these colors may be different based on the code of the sheet you are using, but these are the defaults. To get green, just set 7 as a critical point. For red, set it as a fumble point. For blue, set it as a critical and fumble point. The blue code looks like: [[1d20cs>20cs=7cf=7cf<1]] Edit: Note that you'll also want to include the normal critical and fumble points as well. I've edited the code above to reflect that.