There are some at [1,2,3] but I'd be curious to find more too (or at least download/purchase 3).

1: https://lastjourney.exeter.ac.uk/last-journey-wallpapers/ 2: https://www.researchgate.net/profile/Michael-Ziegler-6/publi... 3: https://issuu.com/universityofexeter/docs/the_painted_forest...