My own personal freestyle in my head (I have many dances in my head - my other half points out many of them involve me or my partner going into the light and maybe I shouldn't give up the day job) is:
Metro Station Shake it
Let's drop (salsa drop)
First verse (tango)
Knee slide
Paso bit
Chorus (jive)
Pro copying my awesome moves obvs
Shake it (some shaking, natch)
I also had a Bollywood number but Will Young did it, the cad. Wasn't to Jai Ho though, was to maahi ve because the chorus is awesome (in my head Anita and Gleb danced a freestyle to this and won. In a parallel universe).
m.youtube.com/watch?v=1BWdglekty0
I also choreoed a Mulan routine in my head before Val went and nicked it and a hobbity rumba before DWTSireland botched it.
Happy times. I would like to see a Katya freestyle though. Kev - not so sure, he has had a chance four times now and though I liked Kellie's no. it was,frenetic and her dress and wig were a disaster, Lou's was contempowaftybollox , Frankie's was all right grandstanding band standing iirc jumping on things, Susanna's had a lot of dry ice). I want to be dazzled!!