Blue Paint for Sale

At the yard sale I found
A lone can of blue paint.
I didn’t see any
Other paint around it,
Just this half-empty can
Of blue paint. What a waste!
Blue paint is so useful…
Blend it with red to make
Purple; mixed with yellow,
It yields a lovely shade
Of green. It’s suitable
For painting a blue sky
Or a crystal-clear lake
Or bright blue aliens
On the walls of a child’s
(An adult’s?) dream bedroom.
Fantasies sprout wildly
From a single paint pot;
Fevered imaginings
Need but a few brushstrokes
To bring forth a jungle.
Whole blue worlds may erupt
From this one small purchase!
Now… can I find a brush?