I often do a few terrain pieces to accompany an army painting project so I set upon the task of making three pieces of difficult ground for protecting the flanks of my Anglo-Danish army. The materials and tools I used for the construction part of the project are as follows:
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The base sections were cut from hardboard with a heavy duty knife. I use milliput to provide a solid platform for the stones and to give some variance in the level of the ground - it's rough terrain, after all. After the stones were set, I stuck sand down to the terrain piece with PVA glue. I have a big pot of acrylic brown paint from the DIY store - it's close to Vallejo Burnt Umber - for basecoating all of my terrain. After a day of drying, I mix a bit of PVA and water to the paint to give the terrain a solid, tough base.
I painted these in a similar way as I did the bases for my Anglo-Danes. Next step is a drybrush using Vallejo Iraqi Sand.
Another quick blast with Iraqi Sand, then a final drybrush with Iraqi Sand mixed with white.
Next I mixed up a greyish-brown to basecoat the rocks. Don't be too heavy and thin the paint down a bit with water. Add white to the paint for drybrushing. Following this I added stains to the rocks. I used very thin mixes of Vallejo Charred Brown, GW Ogryn Flesh, Vallejo Earth and black and dabbed them on in patches over the rocks. I did not wait for each colour to dry before doing the next so that they would blend in with each other. It achieves a really natural look to the rocks.
In the next pic you can see the finish on the rocks - after the stains are dry I drybrushed them very lightly with Iraqi Sand.
Tufts (available in the online store), twigs and leaves, plus a bit of dark moss, were added to finish it off.
As I said at the start, I did three pieces. The following two pictures show the others.