Alright, Ive finally decided to post about this and see what I can find.
Im red/green color blind (shade blind) and have learned to deal with most aspects of the game that are not friendly to color blindness except for locating the mob I have targeted.
One example is in Mount Hyjal, when a mob is targeted the name appears red over mutiple monsters and a green / brown floor. It is nearly impossible for me to find the mob after I use my assist macro. I usually run around the pack of mobs hitting attack until I see numbers come up and then can squint and find the mob i am targeting.
Im looking for a mob that once something is targeted, be it a player or monster, something like a dark colored arrow pointing over the head of the targeted player much like the ogrilla bombing quest where the arrows point to you what to bomb but of course, not red.
Any assistance would be great, or if you too are color blind and have found ways to deal with this please let me know your secrets :)
Sadly there's not much you can do. About your only solutions are:
* Become a hunter and make love to hunter's mark (that arrow you speak of, same texture)
* Discuss with your raid, have them promote you so that you can mark, pick a mark that will always be for your use only (say, star or something)... and make a macro that sets that mark for you.
Second option is the only one I think will work for you. Nameplates won't cause they aren't always directly overhead, especially in the clusterfuck where you'll be needing this most.
Is the target circle on the ground not enough? Or can you not see that on the ground texture?
I can feel for you I have the same exact type of colorblindness. I would do what Tekkub suggests and talk to your raid. If they are reasonable people they will understand...if not well then maybe look for another guild that is a little more understanding?
When you have marked a mob to pull out from the pack to kite around the Hyjal camps, type /focus (make a macro for it) to mark it as your focus target so you will never lose the target. You will of course need to use a unit frame addon that supports showing Focus Targets, but almost every unitframe addon does nowadays.
Your target's name appears even if you have names turned off, so you can just search for the thing with a name over its head.
It's not perfect, I know, but it's the best I could think of aside from what's been said.
Shit, I didn't think of that, that's a very good idea. Maybe even make a mod that toggles names off as you enter combat. I have one that toggle nameplates, would be simple to modify.
Another option, if you're always assisting, have your MA install an addon that sets the skull automatically to whatever he's fighting... or have him make a macro that does it so he can mark the mob he wants you (and everyone else) on.