for our wall

http://www.bpa.gov/corporate/kr/ed/geothermal/sec3.pdf

this has a great info booklet with awesome pictures.

<--for industrial sized power plant stuff

http://www.winecellarinnovations.com/blog/2011/01/05/wine-101-passive-wine-cellars/

for all you winos out there, how a basement can utilize stable temperatures. well this kinda is close...

http://www.premierindoor.com/geothermal/geothermal-installation

woulda posted this but it's a gif more than a pic so you can click on the link to see how geothermal works in a home.