My 6-year-old nephew played KMines and asked me what a mine is; I didn't want to go into too much detail. The day before we were collecting garbage from a hiking path. With this new theme there is a nice connection to this activity which is closer to our current daily life than defusing mines.
Screenshot see preview image: https://phabricator.kde.org/file/data/a4cbjr4puvdy7mfmxf7a/PHID-FILE-pobljcuv3fwxe5vccdwj/kmines_waste_preview.png
It is based on the default Oxygen theme but with green base color instead of grey, cigarette image instead of mine and trash can image instead of flag.