I've been trying something different with resampling my screens. I'm not sure if I like the dotted line fake tiles, but I might try the same thing with circular tiles and/or square tiles of different colours/opacities.
In case you're wondering what I'm up to here:
Added background as shown
Added blank tiles using TileGap app to top area of screen, then set tile transparency to full (invisible)
Arranged real tiles as I wanted them
Replaced wallpaper with solid black graphic, took a screenshot
Opened Photoshop with original picture wallpaper on lowest layer, black screenshot above
Inverted black screenshot so that it's white with black tile icons
Blurred that layer, set Blending Options to Multiply, thus making all the white transparent
Exported the whole image as a new wallpaper with "shadows" of the icons, loaded that into the phone
Now the white icons are visible against the almost white background, thanks to the shadow