The three inscriptions (click through for larger versions) are:
Balle balle — apparently an expression of happiness in Hindi;
...which I take to be in Urdu, given the Perso-Arabic letter g, and the fact that Oxford has a larger Urdu-speaking than Persian-speaking community. This may have something to do with a moment of uncertainty.
And, last but not least, what is apparently a Chinese saying to do with walking:
I'd be grateful for translations — both to satisfy my own curiosity, and in order to caption them properly on flickr!