Modify Plot Color

[Manfrom1968]

To my knowledge ThinkorSwim's has no option to change the line thickness on the Line Chart. Hoping I could get around this with an indicator. The image below shows how thin the line is on the Line Chart.
Thinkorswim Line Chart -


This is what I have now.


The script below will plot price as a line with a desired thickness and color but it just draws the line as one color. Is there a way to have the line be drawn green when price it is going up, red when it is going down and grey when it is neutral? Added bonus - It would be great to have the option to select those colors in the menu.
Any help is appreciated. Thank you.

Current Script-
plot Price = close;
Price.SetLineWeight(5);

 

[MerryDay]

@Manfrom1968
Price.AssignValueColor(
if price>price[1] then color.green else
if price<price[1] then color.red else color.gray);