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Hi all. I'm a photographer living in Alaska. I've been looking at props for my studio and one of the things I really would like are rocks. However, being in Alaska I'm looking at several hundred dollars for the rocks (see rocks here: about halfway down) and then another $200 or so for shipping, which just boggles my thrifty little mind.
So, it came to my mind that one could possibly build rocks that are sturdy enough using papier mache. However, I believe it would require using an armature which is something I never did in my childhood projects. I would like to make the rocks sturdy enough that I could seat an average sized adult (150 pounds) on it without fear of collapsing it.
I realize they will likely end up heavier than the sold ones, but I'm fairly strong and if I build one and can't move it...I'll stop. 
What would be your suggestions?
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Do a bit of experimenting first. Collect a dozen centres of toilet rolls, all the same length. Stick one end on a strong piece of card. Cut a piece of strong card to cover the tops. Now see how much weight they will take. I think you'll be surprised.
If this works for you, you have a basis for making 'rocks' that will support a seated individual easily.
Please let us know how you get on.
DavidO
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Thank you! That's great advice. And with 4 kids we go through a lot of TP. I'll announce the save the roll policy immediately! I just want to avoid claims on my liability insurance. *eyeroll*
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4 kids? Now how many rolls does it need to support all four? Please tell us. You just have to make sure they don't apply a sideways force.
DavidO
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Interesting idea.
Maybe corrugated (thick stuff with the Vlining) bent accordian would make stronger support. You could trim some of it to give a base more rounded.
Might check some of the pm furniture sites and artists listed here. They gave me great ideas on creating strength in things people stand, jump, sit on (darn kids, stop jumping on my projects!).
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If they only have to be sat on in one direction (and not from ANY direction), you could make an inner frame of wood, like a cube frame made of 1x2s screwed together with a square of 1/2" plywood on the top for the seat. Then form crumpled chicken wire (1" mesh) around and over it, stapling where it meets the wood. Think of a puffy-looking stool. Cover with PM all over, cover with a mottled grey/brown latex paint, and while the paint is still moist, sprinkle with clean sand (construction sand, not salty beach sand which can conflict with the sealer).
Sue
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