Fruiting Rockery Cover / Vine??

Hi Everyone,

We live just outside Toowoomba, in QLD and we have a rockery area, which we are wanting to cover in some sort of fruiting ground cover / rock cover. I am wanting to make the most use of the area and would rather put the spot to several uses, not just cover it in something that looks pretty. Does anyone have any ideas of something? I was assuming some sort of berry would be suitable, but I am really not sure. We get frost here over winter, so perhaps something frost resistent would be best. Does anyone have any ideas?

Basic idea:

[li]a creeper/rock cover[/li]
[li]fruiting / some kind of eddible use[/li]
[li]Frost resistent.[/li]

Thanks for your help

Mark