How do I fake accent?

Now, as a non-native speaker, I naturally have this weird accent that somehow pops up sometimes among my tv-show influenced bland vanilla american accent.

The question is, how to fix that - and has anyone tried "learning" another accent? Might be cool to pretend you're an Australian sometimes.

accents have to be learnt, you don't just absorb them. you need to sit down and work on it.