Auto-Upgrade For Units

I want my units to upgrade themselves one level of both dmg and armor every, say, 15 minutes. Anyone?

Oh and I also want to know how to get Text messages into color. Here's the tricky part... I want a variable string to change color... So if it says (Player name of (Owner of Triggering Unit)) or something like that, then I want the text there to be in a specific color.

The upgrade issue is the most important one though.

Right, well here's the first part

Event
Periodic Event every (15*60) seconds of game time
Conditions
-
Actions
set variable (levelOfUpgrade = levelOfUpgrade + 1)
Set level of upgrade (whichever) to (levelOfUpgrade) for (desiredPlayer)

And as for the second part, just make a variable that looks like this (say you wanted red)

string = consecrate ((|cffff0000) + consecrate((Player Name of (whoever))) + (|r)))
or in other words, make it so that its composed of a section denoting color (which can be some other variable that you change seperately) the text that u want, and a color terminator, so that the whole of the text isn't affected.

Enjoy