Copyright - Creative Commons (CC BY-SA)
Unless stated otherwise on the design pages, the Creative Commons BY-SA license applies.
This license enables reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use. If you remix, adapt, or build upon the material, you must license the modified material under identical terms. CC BY-SA includes the following elements:
BY: credit must be given to the creator.
SA: Adaptations must be shared under the same terms.
That's a long way of saying if you modify a design, your new design is required to adopt the same CC BY-SA copyright license (e.g. you can't charge money for it). If you send it to us, we'd love to host the design here.