I'm actually not 100% sure that there is anything out there like that. I guess the next time I make a new profession with one of my characters, I can write everything down and post it up.
However, it does depend...you may have items that you have found or picked up in the AH and I may not be able to give you that information.
I'm pretty sure however that the colors change every 5 lvls or so. For instance, if Enchant Chest - minor mana is orange at lvl 35, at lvl 40 (since you can now acquire a new recipe from the trainer) it is yellow, while the new recipe is now orange.
*statistics are NOT based off the actual game - only giving examples*
Just go with it...obviously, don't make anymore wool bandages if your maximum skill level is 150 and you are at 150 and making wool still gives you more skill levels...wait until you get the next training (lvl 225).
Other than that, I don't think anyone has taken the time to write down when each item turns the color. Just watch it, and when it's green, it's most likely time to go back to a trainer to learn more.
I would say go back to a trainer either everytime the most recent turns green or every 5-10 skill levels....or both...it just depends.
I guess this will be my challenge the next time I start a new profession...consider this my quest. :P
Ay