I use the excellent wallpapers from the site I linked.  I have 3 monitors, and there are multiple-monitor (i.e. intended to span) versions of all this person's newer work.  Is it possible for a dream like Neil Banfield's snowflakes to work with a "wallpaper" that was created like this one?

The wallpaper was generated by DisplayFusion and is actually somewhat backward.  The smaller image is on the LEFT (since that's where my 17" monitor is relative ot my 22" monitors on my desk).  The 22"s are even in height with each other--the 17" is below and to the left.  Therefore, DisplayFusion had to do something funky to get this wallpaper to work, but it operates as designed.