Here is a step-by-step guide to a Iwagumi style set up I recently did. This is a 5 gallon Fluval tank, so really small, and sits on a bookcase in the living room. I will post more pics as it grows in!:
Phenomenal 50 Aquascape Aquarium Design Ideas https://meowlogy.com/2017/04/04/50-aquascape-aquarium-design-ideas/ In this Article You will find many Aquascape Aquarium Design Inspiration and Ideas. Hopefully these will give you some good ideas also.