Circuitry Snacks web site at
http://www.evilmadscientist.com/article.php/circuitsnacks gives tips how to make circuitry snacks! Those snacks look like electronics circuits.
If your two favorite things in the world are playing with electronics and playing with food, this site is well worth to visit. The page begins by gathering up appropriate snack-food building blocks and making food-based models of electronic components. From these components, you can assemble “circuitry snacks”– edible models of functioning electronic circuits.
Below is one full edible circuit example. The resistor values are 100 k (x2), and a 1 uF Nilla wafer ceramic cap. The LED load resistor is 330 ohms. (orange-orage-black-gold)