My cell phone just has the default wallpaper, but I don’t use it very often.
The PC has a series of alternating photos(8 or 10), most of which I took myself while paddling my kayak. Among the best are a a flock of white ibis taking flight with the sun glowing through their wings, and a group of roseate spoonbills standing and dabbling their bills in the water and not caring that I was casting a lure from my ‘yak only 20’ from them.
The best of those that I didn’t take myself is from my SO’s dad who got a perfect pic of an osprey pulling a mullet out of the San Jacinto river with its talons(while I was obliviously fishing with my back to this action).