As long as you are not going to sell it, make it & maybe include the place of inspiration on the label. And no you do not need to buy a pattern or a kit if you can make it without one. To a point, this can only get as sticky as you allow it. Are you going to take a pic & have it published all over the place claiming it is your design? No. So okay, anyone can make a block or quilt if it is an easy one to do or is out there somewhere for all to see & figure out for themselves. Make it & enjoy. My 1/2 a cent may be wrong but geesh this just gets my goat at times & gets carried too far. LOL