Here is a worksheet for early finishers that you, your art sub, and your students will have fun with.
Kids love drawing cartoon figures but they also like seeing reference material to inspire them. This worksheet for early finishers has the lightly drawn outline of a turtle, surrounded by boxes of sample items a student might like to add. They can add the designs given and combine them with ones from their imaginations.
Students end up with an original cartoon turtle in this no fail activity.
This is in my TeachersPayTeachers store, Art Sub Lessons, for just 99 cents.