The Joy of For-Loops in Making Figures

I love TikZ, the "vector" graphics package for LaTeX. One of the biggest reasons is that I can programmatically create the drawing. For example the nested foreach loops in this code saved me lots of work:

	\documentclass{article}
	\usepackage{tikz}
	\usepackage{pgffor}
	\begin{document}
	\begin{tikzpicture}
	\draw [fill=gray!30]
	(0,0)
	coordinate (front top left)
	-- ++(5,0)
	coordinate (source) [pos=0.5]
	coordinate (front top right)
	-- ++(0,-0.5)
	coordinate (front bottom right)
	-- ++(-5,0)
	-- cycle
	;
	\draw [fill=gray!30]
	(front top left)
	-- ++(60:2)
	-- ++(5,0)
	coordinate (back top right)
	-- (front top right)
	-- cycle
	;
	\draw [fill=gray!50]
	(back top right)
	-- ++(0,-0.5)
	-- (front bottom right)
	-- (front top right)
	-- cycle
	;
	%front left corner (0.5, 0.35)
	\foreach \y/\d in {0/0,0.5/0.25,1/0.5} {
	\foreach \x in {0,1,2,3,4} {
	\draw [fill=red!70]
	(1+\x-\d,1.35-\y)
	arc [start angle=180, delta angle=180, x radius=0.25, y radius=0.15]
	-- ++(0,2)
	-- ++(-0.5,0)
	coordinate [pos=0.5] (top)
	-- cycle
	;
	\draw [fill=red!60]
	(top) ellipse [x radius=0.25, y radius=0.15]
	;
	}
	}
	\end{tikzpicture}
	\end{document}

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