We want to see your list!Or at least I do. No requirement, but -- out with it!
1. No Hawkeye themes - this should be self explanatory
2. No political themes - I don't care what political spectrum you fall in and it has no bearing on the work you do.
3. No American Flag themes, back the whatever themes, no military themes - these have nothing to do with your business and no bearing on the work you do, you are just trying to pander.
I usually see things as I'm driving around and make a mental note of how tacky or cheesy it is.
