The photographs are copyright, and you should not use them, even for your own use, without permission... This is always the case, but it is worth asking for permission, especially if you do not plan to sell the end product. If you get permission, and subsequently show the quilt, you must credit the artist... There is a lot of nonsense talked about copyright, including the merry idea that you can change a proportion (usually quoted as 30 percent) after which it becomes your design. This is rubbish...I understand that, in the US, if I photograph your artwork, then you still have copyright on the image. In the UK, if I take a photograph, even of your work, then I hold the copyright of that image (there are exceptions), but do not therby acquire the right to copy the work...
Minefield time, folks...
Helen Howes Our Lady of the Biscuits...