Once you can sleep at night knowing you have ownership rights, you can decide whether to leave them unregistered or proceed to register them. Unregistered design rights overlap with copyright to an extent and the protection afforded is decent to say the least. Go for registered designs if the design is more complex and vital to your business. If you don’t have the time or the cash for registered designs, just take the cheap practical option of sealing your design in an envelope and mailing them back to yourself through recorded delivery.