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 isn't just my language, it's also a pretty picture of an extra-terrestrial sunset! It says, "I will see a different sun set from another planet's sky." in Gallifreyan too.
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.