Textiles.
She looked at varied shapes and textures hanging all around her in the stall. Of all the places on merchants row, this was the one that brought her the most inspiration. It was a never-ending kaleidoscope of color and patterns that constantly changed with the light.
Looking for new inspiration for strings for your tiles? Grab a magazine and open it to a random page. Look at the picture on it. How can it inspire a new string for you? For this tile, it was an architectural image of part of the front of a building showing how the stones were arranged along one side. Try it and see what you discover!