I've recently switched from aspen to a mix of cypress and fir bark. I think it looks a lot better. Her enclosure, an exo-terra large, is kind of a darker brown background and brown foam on the sides. I'm using about a 50% mix of both of both. It's been keeping my humidity kind of high though. Like 75%+, when I first switch the substrate. I think I'm gonna switch to about 25% on the cypress, to try and get the humidity levels down a bit. hope this helps