I have managed to get my name coloured, but my whole name being done in different colours is not working, is there a limit to what i can put after the "/nick" command?

I don't think that there is any limit, just make sure that to change the coloured name, first type the name, highlight the area you want blue, then press ctrl + k, choose blue. Then highlight the area you want red, press ctrl + k, choose red...

And so on and so forth... Make sure though, that the name isn't too long...

Actually Yeah i just figured it out, I had a name that was far to long and i coloured every letter differently for a fade in/out effect in a spectrum, but it wont work like that.

thanks.