Different Colors on Bard Ult

I was just wondering why doesn't 's ult change color based on the different skins that he had. His original skin would definitely be yellow, but why not have the Elderwood skin have a enchanted purple color or something. I understand that his ult is similar to , but they could do so much more with it. If his ult does the same thing that does, why not just change Bard's name to Zhonya? I just hope they do something about this because the new Snow Day skin looks so good and just knowing that the ultimate is also yellow for this skin that has blue as it's dominant color is just saddening. Please RITO, change this.