Personalization of our stuff is what makes our stuff ours. Our phones, and now watches, fall square into the personalization of stuff category.
Over Christmas, I got myself an Apple Watch Series 3 and one of many things I really like about the watch is the how easy it is to change the personality of the watch overall. Much like our phones, you can add your own wallpaper or photos to the watch. Though not really all that exciting, sometimes it's just enough to make one happy to have something of their own.
Here is a living (read: I'll keep updating it) collection of wallpapers that work well with my S3 and thought I'd share them with you (and it's a place I can find them again). Credit is given if known.
To save, just do a 'right-click, save-as' action.