Mainly covers when busking, but I chuck in some OC every few songs.
My go to while travelling is Down Under by Men at Work...I change the words up a bit (make it relevant to where I am). Playing it, along with my silly accent, always gets me a bit of good attention.
I do some other old bogan Aussie stuff - No Secrets by the Angels, Working Class Man by Cold Chisel, Solid Rock by Goanna, (I'm) Stranded by the Saints Dumb Things by Paul Kelly etc.
Standard stuff like Nirvana, Johnny Hobo, Johnny Cash, NoFX and Against Me! are always good fun too.