If you want to change the colors on the mClock from a template, just open up Root Explorer, go to sd card, then mClock, then MIUI-Revamped and that's where you'll have all your templates. To modify the xml, just long-press one of the xml, click on open text in editor.
Look for color codes (example: #FF0000). You'll typically see something like Foreground="#FF0000" Background="000000". You'll want to change the color code to a color you like. You'll need to find a good color code chart online for the color code. Once you do find a color, you can keep it solid or mix/blend (two colors). Foreground will be top, background will be bottom. You can change it for hour, minute, day, month, and if year prevails then for year as well. Also for additional Text line that divides/separates any of those mentioned above. Once finished, push Menu hardkey and save and exit. Your original xml will then be dismissed and kept as backup (example: black.xml.bak). That way, if something goes wrong, or you want to revert, the original file will be there while you delete or dismiss the new xml. Your changes will be made immediately once you save and exit and close out of Root Explorer.
Any questions let me know...
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