Much less expensive than store bought. Great for cookies, cakes, etc. Also, can add a drop or two of extracts to make the sugar also taste and smell good. Multiply amount to make as much as you need, but a little goes a long way, visually.
In a snack size ziplock, combine sugar and food coloring of your choice and close securely.
Smoosh around with your fingers and shake until desired color is achieved. To make a very light pastel color, either use more sugar to a regular drop or a very very tiny drop to the 2 TB. Store excess right in the baggie.
NOTE: You can also color salt, cornmeal & coconut the same way.
SECOND NOTE: Look for the NEON food coloring at the store to get some different coloring ideas, also don't forget that a drop of one color mixed with a drop of another color will give you more options!
THIRD NOTE: You can get larger granulated white sugars in the cake decorating section of upper end stores, some craft stores and most specialty bakery shops. They don't stick as well, but they render a wonderful crunch to your finished product. Sugar in the Raw works well with yellow, orange, red and brown colors, but they wont be as bright.