Safe natural looking substrate?

[jovamabob]

Im making a new 2-tier vivarium for my adult from a bookcase. My question is, what substrate can i use?

I want to have a kind of digging area and a non-substrate area in both tiers. Both sections will have hides in, and the hides will be filled with shredded kitchen roll for warmth/comfort. I've been using shredded kitchen roll because aspen made him sneeze. I want the substrate to look as natural as possible though because the kitchen roll doesn't look the best. Since i can't really use aspen again, is repti-bark or Coco-husk safe?

[infernalis]

I like both repti bark and coconut fiber (eco earth)

another option is real soil (dirt) it works wonderful and is natural.

[Donnie]

I have seen quite a few people using repti-card recently and it is meant to be dust free and will look better than shredded kitchen roll. I am sure there are other brands of this type of substrate as well I just don't know what they are called

Repti-Card 800g

[Lankyrob]

I use reptibark for all of my vivs and love it

[nick654377]

mixture of repti bark and eco earth but will prob switch over to just reptibark

[poison123]

I use sand/soil for mine. He loves to burrow.