What I have been up to artistically

is colored pencil drawings. I call this kind a "quadrych"

This is a quadrych of a locust, dogwood, skyline, and plane.
Here is one of a tree line, from mid afternoon till dusk (woodpecker, dragonfly, sparrow, satellite). 

The rule for a quadrych is that, in some way, the lower right one should be over the top.