I'm considering these options, most of which are naturally antifungal; others are aromatic. All I know is I won't miss having to shake out and wash my cloth bath mat.
1. Gaiam's sustainably harvested cork mat ($24 or $42) comes in two sizes and is nonslip.
2. I really want this Hinoki Bath Mat from Design Within Reach ($100). The Japanese wood is mildew-resistant, has a natural lemon scent, and is a "responsibly harvested by-product of forest thinning."
3. This teak mat ($34.79) from Overstock.com is water- and fungi-resistant. All the site's reviewers recommend it.
4. The Acacia Slatted Bath Mat from CB2 ($29.95) is good-looking and affordable.
5. Umbra's bamboo mat ($49.95) is water-resistant and an interesting shape.
6. This teak mat from Viva Terra ($69) is made with plantation-grown wood, and its dimensions could make it work for narrower spots.
7. I had never heard of vetiver, but the plant's aromatic roots are woven together by fair trade artisans to make this mat from Gaiam ($39.20).
8. "Le Spa" Teak Floor Mat ($53) uses wood from government-approved plantations in Indonesia.
9. If you feel like taking on a project, follow Craftynest's lead and make a mat out of wine corks. (Cost? Depends how much Bordeaux you buy.)
(Images as linked)