Cool youtube user name?

I just want a cool user name. It can't be what I'm doing on my channel cause I'm doing different stuff. I'm 12 if that helps I'm blondish lol I love purple cheesecake :D ha ha sorta but I don't want that to be my user name I want something new and snappy like smosh or something that rhymes or is interesting ya know? PLease help I want something cool!