Set Trail Color
This purple Drawing block sets the color of the line drawn.
Sequencing is key, so make sure to place this block inside the 'Draw a Trail' block and before the block that moves the character. (just like you would dip your paintbrush into a paint color before painting a line on your canvas).
Try using this block to make a 'Draw a Rainbow' ability. It's also a helpful block if you're making a drawing pad.