Wooden bed replacement ideas??

[ABX131]

I really admire and appreciate all the hard work that has gone into many of the vehicles seen on this site. I want my truck to look decent but it will be a working truck, not a show vehicle. As far as the bed is concerned, it needs to be replaced, it has rotted plywood with 2 large holes in it. I dont want to use on of those fancy kits for I dont' want to ruin it with gravel, topsoil, bark etc..I was wondering if any one has tried a composite decking product that has the wood stamped finish and color already in it? I would only have to replace it once and it would look good and hold up to WA 9 months of rain. My concern is wether the stuff would expand and contract in temperature swings...Input or other ideas would be great.