Guests using throw pillows to sleep

As an Airbnb host, it has been great to discover that Amazon has a large selection of reasonably priced shams/pillow covers in various colours, fabrics, sizes. I use Ikea ones too but the selection can be limited and I can’t order them online. Along the way I’ve come to learn that square pillow covers can sometimes be called “European shams” (in contrast to the typical shams, which are bed pillow sized).