Another technique the kids and I had fun experimenting with was applying texture to chocolate. This technique is similar to the Chocolate Transfer Sheets, but rather than applying a cocoa butter image, we are simply embossing a pattern. What I love about this technique is that your kids can often find patterns to use on things you already have around the house. As long as it's flat, plastic, and clean, you can probably use it to emboss a pattern on chocolate. Bubble wrap, a corrugated plastic liner from a food container, and a dish drying matt all have interesting patterns and can be suitable for texturing chocolate.
Special texture sheets for chocolatiering can be purchased at some cake decorating stores and online. They're relatively inexpensive, are easy to work with, and are reusable. There are many fun patterns available such as lizard skin, wood grain, and crocodile!
Here's my favorite source for Texture Sheets: Bake Deco
Use Texture Sheets the same way you would Chocolate Transfer Sheets. Cut to size and lay over your chocolate dipped treat while it's still wet. Allow chocolate to harden at least 20 minutes in the refrigerator before removing the sheet.
The kids enjoyed brushing their treats with Luster Dust, which brought out the pattern in sparkly, colorful detail. Luster Dust is an edible food decorating powder that comes in a wide variety of colors and metallics. I like to dust my chocolate dipped krispie treats with gold luster dust to make a "24 karat krispie bar". You can find Luster Dust at most cake decorating stores and online. You can find very good deals on Luster Dust on Amazon. Remember, a little of this stuff goes a long way. Use a soft paint brush and use sparingly. I do not recommend the dusts sold at craft stores, like the Wilton Pearl and Shimmer dusts. They just don't hold a candle to the professional stuff. You can also brush Luster Dust on iced cookies and fondant covered cakes.