[Jack_]

I've heard a bit about BB Australia's new nomination system using points allocation or something, each housemate gets 5 points (I think) to allocate however they choose between their two nominations, the two or more with the most points are up.

Well, how about we introduce the same thing here, but each housemate gets a different number of points depending on how well they fair in a weekly task (similar to Save & Replace). For example;

12 housemates. A task where the outcome will result in each housemate being ranked from the winner to 12th.

1st - 12 points (and is possibly immune, not sure on that one though)
2nd - 11 points
3rd - 10 points
...
11th - 2 points (a normal nomination)
12th - Doesn't get to nominate at all (and possibly faces eviction, again not sure on that though)

The week after the winner gets 11 points and so on as one by one they're evicted...

Works in the same way, each housemate can split their points between their two nominations however they want, and the housemates with the most points (which I think should be a minimum of three) face the public vote.

Tasks could be mental, physical, endurance etc. Varies week on week so that all housemates strengths are catered to. Could even do it live.

Could throw things completely up in the air and it'd never be predictable.