One thing I have done to protect the floor in the van I have now, a Lumina APV (soon to be replaced by an '02 EX), is to get some indoor/outdoor carpet and cut it to exactly fit in the van. I loosened the trim panels and tucked it under on the sides and at the back sill. I had originally put it in to protect the carpet from the 3 kids, but it has been great for hauling just about anything. You can take it out and hose it off, too. I think it is stiff and heavy enough not to move around even if you don't secure it, and it is not slippery, like a tarp, so stuff doesn't slide around as much. The APV has maroon interior and I found a ribbed maroon carpet at Home Depot that exactly matched. If I had been a little more careful about the installation, it would have looked factory. It was cheap, too ($25-35, I think?- it has been several years). I don't know what all colors it comes in, but if you just use it occasionally, the color probably doesn't matter much. It doesn't store as neatly as a tarp, but you can roll it up into a fairly small bundle.