I've seen people use small plastic plant pots overlapping, it's very bendable and seemed to work well.
If you use GS, you can let it skin and then gently and careful mold it to your liking. I've done this, it would work perfectly for a stream bed. In that case, you wont need a base for it at all, just spray it and mold it. If you want it to be removable for cleaning or whatever (I favor "drop-in" projects myself), you can spray the GS on a flat piece of eggcrate that follows the general outline of what you want, then mold it after it skin. That way you can just place it where you want it and cover the edges of the eggcrate with substrate to hide them (it will also help hold it down better). Just make sure you put a piece of wax paper underneath the GS so it doesn't stick to whatever you are sitting it on as it expands (the wax paper will peel right off, make sure the waxy side is in contact with the GS).
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0.1.0 cats: Soot
0.1.0 Polypedates leucomystax: Joe
1.1.0 Bombina orientalis: Starvin' Marvin & Aphrodite
0.0.1 Taricha granulosa: Saphira
0.1.0 Physignathus cocincinus: Rikutu
1.1.0 parakeets
0.1.0 Miniature Schnauzer: Sasha
1.0.0 Python regius: Graham
1.0.0 Pogona vitticeps: Franky
1.0.0 Elaphe guttata: Masquerade
2.2.0 Rattus norvegicus: Becca & Roxy, Speck and Spot
0.0.1 Ambystoma macrodactylum (I think... pics for ID as soon as I can get them uploaded)
0.0.1 Rana aurora
0.1.1 Japalura splendida (plus TWO EGGS!!!)
Fear the Mod? HA! Now you must cower in your boots before the almighty ADMIN!!! (all in fun, of course! lmao)
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