I made my own for a baby shower tomorrow. I just measured out what size I needed, then opened Paint and played around with free clip-art until I got something I liked. I did red dots in the corners of the size I wanted- the first time I outlined them with black lines and didn't like having to cut so carefully!

The dots don't show up. Then I just glued them over the mini candy bars!
I also have cut carstock to the right size and stamped on it. If the candy bar has a removable wrapper, it is easy to measure. Otherwise I just used a fabric tape measure, being sure to add for the glue overlap.
Hope this helps!
Anne