Glad you like the work, Jackar17. And thank you for giving some feedback on it. Always appreciated.
Yes, the changes this mod make are technically simple - it's just altering some RGB values. But there are over 16 million options to those values and to pick the "right" ones among those for each of the three colours that constitute the theme of every faction (and many individual units) in the game for a realistic and satisfactory whole is far from an easy job (as even CA might agree with). If successful, however, the effect is indeed great, as you say, and important for the experience of the game. To me, it's a difference that makes the game playable; I cannot enjoy the vanilla appearance enough to play it as is.
Don't remember my comment about Celticus' Rome II HD. But if I made it, I must have had a reason for it.