Why not can customize the power ups?

the title says everything

Well, if everybody could customize items, then everybody would have a different item roster.

yeah thats are the point

I mean changing their appearance on the circuits

I don't know what's the point of it though. That would be unnecessary.

but imagine theming the lucky block, the power ups for a particular circuit in the track builder in the complete mode

I kinda like this idea, limit it to multicups and it could work! If I got it right, we would change the sprites of the items, it would be the easiest way to make a "item maker" and it could be good for stylised multicups, for example, you make a multicup that follows a specific style, the items could also be on thet style. I know, there could be some problems with it, like, someone changing the banana sprite to look like a fake item box and vice-versa (it would still be good for a troll multicup tho), but I think we could take it for a little more customization

That would work actually.