How do I make/find free designs for 1/72 scale buildings?

[Irishrover13]

Hello all,
I posted this in the WWII and they suggested I post it in here. Ok I have started a wargaming club fro the students at the school I teacher at and we are currently using plastic army men and small boxes with holes cut in them for buildings. I don't like the generic army men and he club is unfunded by the school so I am going with cheap 20mm figures rather then the 28mm figures that I like. Regardless the figures are a surprise for the students since I hope to have them assembled and they will each paint their squad, (We are using point blank so they only need 5-10 minis). 
Now I want to make some building to go with this and since I am on a budget are there any websites that tell you how to build 20mm/1/72 scale terrain from scratch? Preferably out of cardboard and other cheap or very inexpensive materials. I am not too worried about making it stunning because great thing about younger students is that they can see unmodified cardboard box as a house no problem.  I would like to surprise them after Christmas with some better scratch built stuff. Please don't suggest I buy it. I blow my personal budget on the minis there is nothing left for buying buildings.
Cheers,
Daniel   

[gharak]

You could look at paper terrain, I've used it previously and mounted it on corregated cardboard to make it more sturdy.


Some 15mm terrain here, just scale it up a little.
http://wargamingforums.com/2010/07/21/free-paper-terrain/

Or some of these.
http://www.papertigerarmaments.com/BUILDINGS.html

[joroas]

A couple of emails sent. 

[Irishrover13]

Thnaks guys that is great.
Happy Holidays all.
Irish

[General]

When I use printable houses, I mount the printed card on foamboard from WalMart.  The resulting structures are inexpensive and durable.  If you want more of a 3-D look, then print out multiple copies so you can recess windows and doorways, etc.