Overland technical track ideas?

[Buzzer]

I know there is a track forum but this is for overland so I think it's appropriate here.... anyways

I will be starting to work on a modular overland track to use in my apartment. It will have the usual hill climbs, a log bridge (ala Hong Kong track) some jumps and whoops.

I am also going to do a "boulders section" similar this pic
http://mini-zracer.com/albums/arch2b/mz44.sized.jpg - courtesy of arch2b
and a section to simulate hills/rolling terrain, possibly out of paper mache or carved from styro foam or something.
And maybe a section using pea gravel or aqarium rocks(the stuff on the bottom) for a loose terrain feeling

Anyone else got any original or unoriginal ideas on how to simulate an offroad/rally type environment inside? short of bringing a bunch of dirt and rocks into my home.

[arch2b]

how about a log crawl similar to this pic
http://mini-zracer.com/albums/arch2b/mz45.sized.jpg

you could use fat pencils, carved block of foam or something like that. part of the techincal section.

[Buzzer]

I was thinking of using both pencil size sticks, some slightly bigger at around 3/4 inch diameter as well as finding some 1' and 2 inch branches and splitting them in half.
Like in this crappy mspaint pic attached.

Large branches and some small sticks attached. But with most of the small(pencil size) stuff loose.

Comments?:)