Change graph color on system monitor plasmoid

Open-source is fun. This time I want to get my desktop colored a little. By modifying plasma-system-monitor source code and split it into several plasmoid such as personal cpu monitor, personal ram monitor. (inspired by plasma drive IO monitor). This is the final look of my top panel: From the left to the right (the plotted graph): CPU monitor, swap monitor, RAM monitor, net monitor, disk IO monitor. Next project is improving it by adding click event so it will start krunner System Activity when the user click on it.