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Here is the method I used to create some pretty convincing lightweight rocks for a cave formation.
Start out with a block of styrofoam. Next take a can of black or brown spray paint and spray the styrofoam lightly. As you guessed a lot of the foam should melt and come up with interesting shapes.
After you have achieved the look you like - get a DRY sponge, and detail painting brush. You will need the following acrylic paint (about 4-6 dollars a tube.) Sienna, Burnt Sienna, Brown, Black, And White. IF you wan more of a reddish stone grab ochre
1.First lay a thick coat of your base color on your styrofoam piece - in my case I used a lot of brown and applied this with my sponge. YOu want to cover up as much "white" color as possible to get the best effect on the texture.
2. Next I took and mixed a combo of seinna brown with black and white.
3. Dab this into your current base color. I found it works best to get the right mix if the base is still wet. Your goal is to achieve a sandy grainy look with streaks.
4. Pay close attention to the divits or indentations caused by using spray paint. IN order to achieve some more realisim we want to add some shading. Take the black / and gray or mix white and black to fill in these dents, and rough holes. You can dab the pain into these areas. The goal is to fill them so they appear to look like holes in the rock.
6. Do this with multiple combinations and you can create awesome cave faces, stalagtites, stalagmites, solid ground rocks, tombstones, etc....
have fun!
Start out with a block of styrofoam. Next take a can of black or brown spray paint and spray the styrofoam lightly. As you guessed a lot of the foam should melt and come up with interesting shapes.
After you have achieved the look you like - get a DRY sponge, and detail painting brush. You will need the following acrylic paint (about 4-6 dollars a tube.) Sienna, Burnt Sienna, Brown, Black, And White. IF you wan more of a reddish stone grab ochre
1.First lay a thick coat of your base color on your styrofoam piece - in my case I used a lot of brown and applied this with my sponge. YOu want to cover up as much "white" color as possible to get the best effect on the texture.
2. Next I took and mixed a combo of seinna brown with black and white.
3. Dab this into your current base color. I found it works best to get the right mix if the base is still wet. Your goal is to achieve a sandy grainy look with streaks.
4. Pay close attention to the divits or indentations caused by using spray paint. IN order to achieve some more realisim we want to add some shading. Take the black / and gray or mix white and black to fill in these dents, and rough holes. You can dab the pain into these areas. The goal is to fill them so they appear to look like holes in the rock.
6. Do this with multiple combinations and you can create awesome cave faces, stalagtites, stalagmites, solid ground rocks, tombstones, etc....
have fun!
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