Here is a very cool brush effect. Brushes are handy photoshop tools. Almost anything can be made into a brush. Once something is made into a brush, it's there for you to use over and over again. There are thousands of free brushes all over the Internet for free download. The actual brush is the filmstrip. I then added my art of four different cupcakes I created.
After I added the images, I then desaturated the image to create the black and white negative effect. Warning- this is addictive!