Just asking opinion for my information (and lack of experience).
Now I have a question about what is actually considered your “own design”. I am not considering selling the item, I just want to know if it would be considered “my design”.
I have a pattern for a dish cloth that is very lacy and pretty at one edge, when I saw it finished I thought it would make a beautiful table runner. I modified and rewrote the pattern, increasing the size and layout of the lace pattern. Now, is it a new design or just a modified design? It will look nothing like the dish cloth but you will see some of the same stitches (pattern stitch) just laid out differently.