I like the basic color scheme except it is difficult to see at a glance which downloads have completed vs. those that are 98% or 99%.  I've looked in the "custom colors" section of the settings but I can't figure out which descriptor to use to change the color for the text of a completed item.  How would I change the text for a download that has completed to the color white?

Completed downloads are now "seeding" or "seed queue" or "completed offline"
The six main colors you want are under Custom Colors -> "Offline Download text" to "Running Non queue seed text"
The best indicator of these colors for your scheme can be seen if you have Layout -> Categories -> Sidebar turned on.