I actually hate the different size bills of the EU (and other nations). It makes carrying a decent amount of cash a huge pain, since I usually don't put it in

I actually hate the different size bills of the EU (and other nations). It makes carrying a decent amount of cash a huge pain, since I usually don't put it in a wallet. US cash I can fold up and it stays very well organized, EU cash turns into a crumpled mess in my pocket. It's a minor complaint, but I do prefer a uniform size. The colors though are spot-on, and the US is slowly starting to change that. The new $100 bill is easily visually distinguishable from any other bill just due to the color.