Yes, the complete folder is replaceabletextures/worldeditUI/
Also, Earth-Fury was asking where they were located in the mpq if they were in there. I'm sure he could have easily scanned through all the images himself without being instructed to do so.
lol i lloked for 20 min ://// i never thoght they would be a replacible textur ://// then i thoght ,and rememberd blizzard dosent clasify thigns well :////