Please read the notes Move your mouse around to see the trail! Actually uses a couple very simple scripts... Drag the slider to see a longer trail! IMPORTANT To use the paint engine, drag it to 100. The screen should be white and the Clear button will pop up. To exit the paint engine, just drag the slider back.
I got the idea from 7734f's 1.4 project which had a similar script. Thanks the Internet for the music. XD