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i was trying to pick up some green stuff, as i hear all kinds of people talking about it. but, to be honest, i really don't know what im looking for, i mean i have some epoxy putty at my house, like spackling and stuff like that but it's not green. im not really sure exactly what i  need or where to look.

also, i recently got a foam cutter and was cutting myself some walls to make them look like they're old ruins or something, i was trying to go for a like stone slab stuck together look, kinda like bricks, but i dont really know how to accomplish it, any ideas?

You can buy green stuff at most shops that sell GW models.

Here's what it looks like: http://www.bananaking.net/cento/workshop/conv_green.htm

As for the wall, paint it dark grey, then highlight/drybrush it with light grey. Gives a nice stone look with little effort.

The putty you have at home is probably plumber's epoxy. It's usually sold in long plastic tubes and comes with a blue "outside" and a grey "filling". I have some too and I use it for scenery and bases. It works pretty well but I wouldn't recommend it for sculpting.

As for the "stone" look to your foam, all you need is a ballpoint pen and ruler (although I use a t-square, much more stable). Figure out how long and wide your "wall" is. Figure out how many "rows" of "bricks" you want (I usually have 1 every 1 inch). Mark off each "row" with the ruler and then go back and draw them in. Push the BP pen in a little (so it creates a groove over each line). Once you are done adding rows, do the same thing vertically, except stagger your lines (if you don't you'll just end up with a grid pattern)

I would also add that for stone rather than brick you can take a rough surfaced larger rock and press it into the sides and top of your wall so that the roughness is transfered to to the foam.  It'll make the surface more weather-beaten and natural looking.