Start with a simple picture and add filters one by one until you can't recognize the image. See how many different filters you can apply on top of each other before the picture disappears.
Go back to your original picture, and use the Colored Pencil filter. This should give you an interesting image. Save it. Try the other filters over it until you find at least three that work well with the Colored Pencil filter. Whenever you have time, repeat this exercise, starting with a different filter.