i believe that if you have seen something you like, and made something based on it, it is correct to attribute it to them as "inspired by ..........", if you put it on display. i have an online artisan friend who makes wonderful coats and sweaters from recycled/upcycled goods. she has inspired many to copy her, and has released her "real" pattern for others to purchase and use--but even before then, she only asked for attribution when displayed or sold. ultimately, if it is your work, your color sense, your "eye" that made it without the actual pattern, it is your art, with inspiration and visual encouragement. enjoy your god-given abilities!