First get an old cheap plastic food container. The recycle symbol should be on the bottom.
Cut out the center.
Using markers draw a picture on the plastic. Try to avoid letting your hand touch the wet image.
Cut out the image.
Place in a pre-heated oven at 250 degrees fahrenheit. The plastic will curl and move in the over. ****WAIT until it flattens out to remove from the oven***
Remove from the oven and let cool for 5 minutes.