This is cool... I used to drawings, stacked them on top of each other, then used different filters to get these results. Enjoy!
(Also, if you would like to use a background, just ask! But don't use without permission.)

First base

Second base

Then I stack!

Combo #1

Combo #2

Combo #3

Combo #4

Combo #5

Combo #6

Combo #7

SECOND SET 

First Base

Second base

Then I stack!

Combo #1

Combo #2

Combo #3

Combo #4

Combo #5