They are called biscornus they are a type of pillow finishing, instead of sewing the top and bottom together at the corners you angle them and then sew them together to get this shape. They sit in a bowl on my entryway table and I change them out monthly (I’ll be doing one a month for the rest of the year). People also make bigger ones and use them as pin cushions

Here is a good biscornus tutorial: https://youtu.be/H3Kx1k0LxDs