I took a look at your Etsy shop and it looks absolutely fine to me. Strung jewelry can be made just so many ways, and there's usually a more ample margin between what can be considered a casually repeated pattern and one that has been out and out copied.Seed bead jewelry is definitely different, but even so, nobody can claim designer rights on a simple peyote bracelet without a pattern or a striped bracelet, unless a pattern was followed.
The general golden rule is that if you follow a pattern and post the finished piece anywhere, you must credit the designer. If you want to sell it, you must ask permission. Many artists have their personal policies in regards to use of their patterns on their websites. If they don't, you can always write and ask.
Lastly, you have to distinguish between design and technique/stitch. Spirals and their variations, tubular variatons of all of the stitches and the stitches themselves are all techniques, developed and passed on as knowledge and tradition. You can make and sell any of them because they belong to everybody.
A design happens when you take one or any number of the techniques and elaborate on them somehow, transforming them into a piece of jewelry and using just your own imagination. The design is the "property" of the artist who created it, even if the pattern is published and always unless otherwise specified.