If you are blessed enough to already have things going for this kit, you may use it! The rules do not specify that it must be brandnew.
Originally Posted by donakat
Question about my kit:
I did a kit for Design factor (elements only) that had basically this theme and slightly different colors. Can I do an extension of that kit/theme with new elements and papers that use the challenge palette and guidelines? Essentially, I'd just use the same name/theme with all new papers and elements. Thanks for a great challenge!