I prefer the black plastic hides from Reptile basics because they are light weight and easy to clean. They may not be the natural look you are looking for, but you can always cover them with some fake vines or something. Whenever you find the ones you want, remember to get 2 of them. Here are some websites that may help you out...

http://www.reptilebasics.com/hide-boxes/

http://www.animalplastics.com/

http://www.herpsupplies.com/category.cfm?id=7

http://www.reptiledirect.com/hidingplaces.aspx

http://www.reptilesupply.com/index.php?cPath=31_35

http://www.bigappleherp.com/REPTILE-...at-Furnishings

http://thereptilecenter.com/catalog/category/view/id/13

http://lllreptile.com/store/catalog/...nd-misc-decor/