I think some housing insurance policy's(Premium, expensive ones) have a provision for this, items that are in your policy and kept at the residence are covered whilst away from the residence,ie: on holidays. Simalar to extended travel insurance, the higher the monies value of the items, the higher the premium.You can get insurance for anything for a price, unless your Jackie Chan that is.

Try Western QBE - valuables policy. I did have my kites/board (and a few other things) added to my exisitng home contents policy only for an extra few bucks a week.

Yeah Try CGU
I have had an insurance policy with CGU in the past which has personal valuables covered anywhere in Australia even if you lend it.
It was limited to $1000 per item unless specifically specified as a valuable.
I used to have it for my bike and video camera. Had to make a claim in the past for a car burg.

I think I still have that type of policy but not sure as my wife deals with all of that sort of thing