You have to buy a Plurk coin

Then you get more display name color options

detectivefiction ohh, I see! Thank you! I was away for plurk for a bit so I guess I missed that happening!

Even if your coin expires, you can keep the name (you can also give them as gifts) buuut if you change it you lose the color and have to go back to one of the regular ones.

I forgot to reply to this oops! But thank you that's good to know! I'll have to pick a name I won't wanna change fff