A brown Pakari...

A Black Kakama...

All the Kaukau...

A Kraakhan in any other colors beside Black or Gold...

Some of those Misprint masks...

Mahri Masks in multiple colors...

Also, an Idea I had:

This'll never happen cause of cost and whatnot, but, it was an awesome dream (It was actually a dream I had.) It was a special kind of LEGO store where you could go in and order any pieces in any colors you wanted. It was also set up like a candy store, with tubs and shelves of pieces, each with their own prices. You could build your own sets, then purchase them based on the prices of the pieces you used (Though, things like toa sized sets, titan sized sets, and other type things would be standard price as long as they didn't exceed a cirtain amount of pieces. Also, the obvious option, just by parts needed or projects...

In the dream, there was a shelf of masks in all styles and colors... Best dream ever...