Team name colors are written by the game engine so unless you use an editor they aren't easily changeable. Other colorizations are done in individual skin options via the .col file for each skin, found in the skins folder.
The problem with a lot of the other colorizations are that the same colors are used in multiple places.
intcountzero the comparison colors are one of these colorizations that are used in multiple places. This is why when you look at players stats in the practice screens the default red for decrease and green for improvement are so dull and the non-changed stats are that dark grey that fades into the background.
Changing those colors to be more visable on that screen is fine but people may not know those colors are also then used as the three colors in the player comparison screen. If you see different colors there than the default you are used to; they have been changed to 'fit' the skin's color scheme by the skin creator.
To change the comparison colors:
Go to your skins folder and find your .col files. I suggest you do this even if you play the default skin because it makes the numbers more readable. For the default 'Traditional' skin the file is ehm_default.col.
Open the .col files in any text editor. Scroll down to numbers 77-79 in that listing and replace that text with these settings instead:
# UIC_COMPARE_COLOR_WORSE
77 117 29 29
# UIC_COMPARE_COLOR_SAME
78 130 136 136
# UIC_COMPARE_COLOR_BETTER
79 24 112 24
Save the files and the next time you run them they will appear in versions of the standard green for positive red for negative scheme that will allow you to see the stats on the practice page more easily.
Speaking of stat number colorizations; the numbers used on the player pages make no sense to me... it uses white for 1-6, then three shades of yellow/orange too close to each other to see for 7-11, 12-16 and 17-20. You can barely tell them apart so what's the use?
I used red, orange, yellow and green for my skins. I think that makes more sense and you can tell the difference between them. If you'd like to use those colors scroll to the end of a skin's .col file and use this for 88-91:
# PROFILE_ATTRIB_LOW
88 211 72 85
# PROFILE_ATTRIB_NORMAL
89 239 151 4
# PROFILE_ATTRIB_GOOD
90 237 214 20
# PROFILE_ATTRIB_EXCELLENT
91 48 454 48
If you just want all your numbers white you can delete these four settings completely.
For anyone who wants to learn more about the .col colorizations I have a
breakdown of what those options do here in our Guides section.