...does anyone have any tips on how to make your own concrete wall using plaster, paste or any metyhod that is realistic?

if you want to make "broken" concrete you can add "stone" by adding some coarse sand or kitty litter (possibly ground up a little finer) even some stone dust could help. I'd think adding a dye to the plaster when mixing it is possible too.

I've been using leveling compound for a while now. It is actually nice for a variety of surfaces, but concrete was my initial use. It definitely has some different phases as it sets up. Over all it is fairly easy to work with.
Here is my latest project.

This one I used it for the sidewalk and the curbs, as it began to set up I etched the lines in.

The brand name I'm using is

Thanks guys for the responses. I decided to use pink form or insulation material to build my concrete building for my Iraq dio. I think the results are fantastic.