I disagree.
The easiest is to paint, glue, or tape a picture on the outside of the glass. I am a fan of matte black spray paint for just this purpose.
As for background choices, I could probably write you a three hundred page PDF on all sorts of really cool ways to make your own backgrounds and I still would not be able to cover every method. I have done everything from gluing tree bark to the tank , to sculpting rocks, painting pictures, and even at one point, printing out one of John's photos from over at Caudata.org and taping it in place.
Lately I have been using concrete and styrofoam, cork bark and silicone, and have been experimenting with various mixtures of acrylic resin and sand.





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