Oh I’ve seen colorful foreign currency from around the world and how dull US currency looks in comparison. It would be nice if different denominations used different colors but honestly I rarely use cash these days so it really isn’t important to me.
A lot of places still accept checks here but more and more don’t anymore. However it’s not a problem in most cases though because fewer and fewer people use checks. A lot of young people don’t know how to write a check because it’s basically an unnecessary task anymore.