Well, Andrea wanted to make a pair, but wanted to incorporate the eBrush into the project. So, here's her version!
eBrush and SP adapter
White cotton canvas slip-ons
Be sure to protect your surfaces and work in a well ventilated area. Between the Sharpies and Alcohol it gets pretty potent. Adult supervision is necessary.
Seat the marker to get the best spray.
Using the eBrush, spray the colors on the shoes as desired. If you don't have an eBrush, just add color from the markers to the shoes.
Remove the masking from the shoes, but leave the masking tape on the soles to protect the plastic on the soles.
Drizzle the alcohol over the colors on the shoes (if you have the siphon adapter, you could spray some alcohol using the cup adapter and the siphon).
Set aside to dry. It usually doesn't take too long. Remove any remaining masking tape. You can heat set using a heat gun or putting your shoes in the dryer with an old towel. Some of the color may fade.
Here's a quick video too.