Here is my homebrewed camber gauge. I used steel square tubing. Unfortuntely I made the bolts far enough apart to fit the lip of the WRX, which doesn't work on the Civic so I need to get a new tube and redo it....or get a slot milled to make it adjustable.
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The method that Ryan linked to is common: ie using track width differences to set a line that is x mm from the front and x+- delta/2 from the rear. My only qualm with this method is that changing your camber changes your track somewhat (or the distance from the line to the center cap of the wheel let's say).
I wrote up a javascript page that helps you do an alignment (you should find my mathematical derivation I posted on here mid last year). All that you need to to set 2 parallel lines in your garage (I use 4 jack stands and fishing line) wide enough for your cars to park between. Then you pull in between the lines and take measurements (note that there is no need for the car itself to be parallel to the lines....only that the lines are parallel to themselves), plug them into this app and click the calculate button and it'll tell you what your current alignment setting is...then you can tweak to get your desired toe and then set them accordingly (meant to update the app to be able to take initial measurements plus desired alignment and spit out the changes you need to make.
Anyway, I'm changing hosting, so I don't have it live right now. I'll post it tonight when can get to my desktop.