Look at my desktop, it looks like Mac OS 😉
I would like to share about a theme, I am impressed and already using on Laptop. I have already tried for Macbuntu 12.04/Macbuntu 11.10/Mac4lin, Mac Ubuntu theme and and Elementary as well. But Here i found which is very much relevant to mac then other themes. It id giving me a feeling like Mac in terms of icons and courser theme.
You can follow the instruction to install this theme from NoobsLab.