How about a new kind of color for gradients joints etc.
and a new type of hair a new items that would help in the ingame

This is something that has been suggested a thousand times beforehand. Colors have been suggested but denied, the reason is simply because they looked to similiar to the ones already in the shop.

About "hairs", there is a team of forgers working on hairs and such... So just be patient and there will be new to choose from.
As you can see at the top of the page they're introducing the Tori & Uke hair which was just made.

actually there is every possible variation of colours avaible. if they would implement a new colour, it would look like another one because u cant see the diffrence directly.
there is a item forger team, which is working on making some new stuff.. just be patient and wait. theyll bring out new hair like every month etc.

I guess there would be no more new color joints/gradient since there are already textures.