Doing a search for chevron tree skirt, I came up with lots of images. Here's one from Etsy that looks like a giant Dresden plate.
https://www.etsy.com/listing/1653713...w_type=gallery
Then I did a search for Dresden plate tree skirt and got lots of amazing images! Maybe something here will work for you:
https://images.search.yahoo.com/sear...t+pattern+free