In 2009, artist Lee Walton exhibited his "destination specific" sculptures: brightly colored, asymetrically-shaped slabs of plywood, dated, with directions for being taken taken out of the gallery and "displayed elsewhere". He drove one to a field and leaned it against a tree stump. From a distance: a winter field with a surprising blast of red.
It would be easy enough to do: have a piece of plywood cut at the local lumber store, or use a scrap (it should be a size and shape you can carry easily), paint it a hot color, then…put it somewhere to enjoy.