I've goofed around with using "junk" peices to get the height I desire but something inside me nags away saying "but... maybe someday you'll NEED that!" Plus I found that it was never as sturdy as I wanted, or as versital. I know money is allways a concern, but it may just be worth it to bite the bullet and buy some red, yellow, or blue 2x2 and 2x4s on bricklink (they are pretty cheap)
If you are refering to those windo pieces, yeah. They are not so versital. They are weak for supports. I used them right there because I was using green 1x6s and 2x4s and I couldn't make the gap between each support very big. Now I am working on the road, and because I am using large dark tan pieces and large green plates, I can use the method you are talking about, and not use so many bricks. Thanks for the suggestion. Tonight I will probably finish the landscaping (At least the ground) and so I will probably update it then.