Bio active/ naturalistic vivs for my lizards?

[Hannibalcanibal]

So, long story short i keep my lizards on paper towel, to clean it easier and to minimise risk of impaction. However, i have been hearing a lot about the benefits of giving real soil, complete with all the bugs, seeds, and others.

In a nutshell, i was interested in hearing about bio active/ naturalistic vivs. My lizards are all very healthy as it is, but i was wondering... is there a better environment i could give them?

If it matters, i have one mali uromastyx ( had him since i was 11, love the little guy..), two leopard geckos (separately housed, one i had since 11 and one since 12), and a bearded dragon (had him six months, bought from a breeder- lively little guy).