@beelee I would suggest erasing the flags which is easy to do in Paint. There is no reason to have flags in unit images, as you can turn flags on with View/Flag Display/Small.

@TonyMez

If you like the Anniversary ones, you can copy and paste from it's units folder to your game.

Edit
will ping @ebbe as he did Oil and Snow

Edit 2
This a good guide by Elk https://forums.triplea-game.org/topic/3435/a-brief-guide-to-making-units-colorize-re-scale-etc

China is green, United States is green. I like blue. I tried using an AI but couldn't seem to figure it out. I have paint.net but can't rub out every unit with an eraser. I am trying to use these units because they are color enhanced, the rest have flags under them but Italy in blue. Anyone know an AI that cleans off these flags or 1 that adds flags or 1 that changes colors. I played around with a few ai's but couldn't get it working.

I like the infantry units from the oil and snow except Italy. I got those infantry only and for Italy have this 1 because it has blue sort of in it.

@ubernaut I meant as a national colour. The French were also not blue any longer in WW2. Obviously, the Russians were not red either: that is the international colour of Communism made into a national colour. The actual colour of the Italian infantry, though, was actually mostly grey with a hint of green: it was called "grigioverde", which means "grey-green".
https://www.militariainroma.com/en/product/italian-rei-ww2-m39-shirt/