Colleges and high schools all over the country usually have their students dress up in a full cap and gown for graduation. In order to make the outfit complete, there is almost always graduation cords dangling from their caps as tradition. These graduation cords can be purchased at a variety of locations making it vital to enlist a service with a proven reputation. Most of these companies will indeed customize these cords with your school colors and such so that they match the rest of the gowns.
Once you find a service, it is likely they will show you examples of past work so you can see the quality of graduation cords produced. However, there is no reason not to do some research when making a purchase and the internet is a good place to look. All that is left to do is send your students off at graduation.