Color coded guild vault ?
 

If possible can we see a color coded guild vault addon? So when looking through 60 mastery spells, we can actually see which ones we can use and which we can't?

Something similar to how the broker / personal bags work now. If you can not use it the background is red, if you can it's tan? Would be even better if the background was a different color, when you can't use it yet but will be able too.

Dunno if this is possible or not, but it would be nice.

The background colors are controlled by the game, to my knowledge we have no way at all to recolor those based on whether you can use them or not, that data is sent by the game directly in the cases where it exists (like your bags).

this makes me a sad panda =(

/feedback it in game and possible post on the official forums. Best we can for stuff like this! :(