Skin change for heroes?

Basically, when you upgrade your hero, the hero's skin will go with the theme of the th it belongs to. For example, th7 lvl 1-5 barb king will be yellow, the lvl 6-10 will be dark yellow, th9 lvl 11-30 will be all dark, then th10 barb king would be red?

I don't know if this idea was already introduced, but yea. What do you guys think?

I think it would add unnecessary server load but why not? Idea's not bad at all, everything besides heroes does change appearance when upgrade it

it could be a good idea, don't make him to red tho, as that might be annoying to look at.