Jungle themed houses are awesome and unique. They can be messy but that is part of the theme and there is no right or wrong when it comes to the jungle. I will list some key/base details and the rest of it depends on your preferences
That is the jungle that I created.
Key/Base stuff:
- Floor covering: Folded Artefact Carpets - Ring 
for the jungle and Cube 
for the water effect.
- Leaves: will help you filling the surface and giving the impression of a real jungle. It might take some effort but it will be worth it. Guide here: TibiaFanArt - Leaves
- Forest stuff: Trees from the Cults of Tibia Quest 
, Naga Nest 
and Indoor Plants 
.
- Small details: The small details are completely personal, you can look into some lists of flowers, items obtained during some quests and pick the ones you prefer to create your own jungle. Floral Decorations / Flowers Tibia / Flower Pots the Entire Year
I know you have asked for a decoration without any store items but you can try to include Podiums of Vigour 
displaying some jungle bosses. You can get them using in game money with Emael in the Adventures Guild. They only cost you 1.000.000 gp. As you can see in my screenshot you can display a lot of jungle themed bosses. List of the displayed ones: Hairman the Huge, The Welter, Oodok Witchmaster, The Frog Prince. Remember to choose the stuff that you like and create your own jungle! We are just giving you the options available.
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