I feel like most shaco skins are pale and almost recolors of base shaco. Except for Wild Card (even tho the coloring is meh) and Masked Shaco (the only okay skin he has imo). Shaco's base look is probably one of the least original of all champions and it'd be nice to have a more flashy or stylish skin with good animations and effects like project/arcade/suprise party/hextech/mecha skins
I think he needs a Boss skin. Twin Boss Shaco, to be precise.
I think the reason he doesn't is because he really doesn't have much for flashy animations on his abilities that artists and devs can play around with.
Other than his boxes, there really isn't much to play around with like there is on champions like say 
for example. she has a lot of flashy abilities that can easily be played around with, as seen in here last few skins like elementalist and star guardian.
Gotta say hextech 
could look pretty cool
