I've made an entire working language (more of a code, really, but language sounds cool) based on circular Gallifreyan in Doctor Who. It has a real structure, but I'm not going to give that away.
This says, obviously, Gallifreyan Exports. I'm going to be starting up an Etsy shop fairly soon to start selling some things with writing on it in this language.
Let me know what you think! And don't be too harsh.
Disclaimer: I do not own Doctor Who, BBC does. Please don't sue me, I love you.