I copied a neighbors approach, and added color to my hangar with flags.
Misc. 3x5 flags are less than $5 (printed only) and a really nice 4x6 US Flag (heavy and nicely sewn) was only $21 through our good Senator (Kyl...

...). Even came with my name on a certificate and was flown over Congress...
The small flags are from all the places I have lived...
Posters also work, but are more $$$. I particularly like the WWII RAF one on the left ...
It says
"Don't Carry It In Your Head - But Know Where To Find It - Careless Work Costs Lives".
Definitely still applicable in this present era....
gil in Tucson... brightening up the workspace...