NKBAChiefUser

navigate to Tools > Layer Settings > Display Options. Then, select the desired layer set and modify the background color in the Properties for Selected Layer section

This is the best/easiest tile creation website I've found. It has all the tile patterns already made and you just import a photo of your desired photo. It will make whatever pattern you like. https://architextures.org/

How about this one? I have this tile in my library but can't upload it here due to the 14mb max file size. Maybe I could send you a link to a google drive or something.