Short answer

You can customise your chart’s candle colours by changing the body, wick, or border colours from the default green and red scheme.

ChartIQ

Click on Settings.

Click on New Theme.

Select the colour for the body, wick, and border.

Enter a name for the theme and click on SAVE.

TradingView

Click on Settings.

Select the colour for the body, wick, and border.

Click on OK.