Compared to the endless variations people have created based on the California state flag, the Oregon state flag has for the most part been ignored. We’ve come across these examples — do you know of others?
The first two are from Maddish‘s blog, The Voice of Vexillology, Flags & Heraldry, in an interesting 2010 posting entitled British Columbia Mojo. During the period from 1818-1846 in which Canada and the US had a sort of joint custody of the Pacific Northwest — the “Oregon Country” (as it was called by the US) and “Columbia District” (as it was called by Canada). Which lead him to think about merging the British Columbian and Oregonian flags.
There is also this meme-ified “put a hammer-and-sickle on it” version:
The reverse of the flag gets some attention.
Finally, a lovely example can be found on merchandise by the Portland-based rock band, the Dandy Warhols.
Portland Flag Association 
How about “SPEED LIMIT 55” in gold on a blue background?