@Elladavis what do you mean by adding colours? Do you mean the leading string, and the other strings that arent the base strings? If so, then yes, you can add them like how you normally would, by attaching them somehow, like for example tape.
@Puppy12345 You could find them at craft stores like michaels, you could also buy a pack of like 100 on amazon. But i suggest buying off of etsy to support small businesses! Especially bracelet businesses on etsy you could look at some of those, they might have some. Thank you! ❤️