Answers to Rec 12

NOTE: There are many possible alternative answers.
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A. This is straightforward
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B. Circles

Here is one answer:
%!PS-Adobe-2.0
/n 40 def
/r 100 def
/s 100 def
/inch { 72 mul } def
/Black { 0 0 0 1 setcmykcolor } def
/Red { 0 1 1 0 setcmykcolor } def
/CornflowerBlue{0.65 0.13 0 0 setcmykcolor}def

4 setlinewidth
/circles {

  CornflowerBlue
  newpath 0 0 s 0 360 arc stroke
  Red
  /incr 360 n div def
  0 incr 360 {
    /th exch def
    newpath th cos s mul th sin s mul r 0 360 arc stroke
    2 setlinewidth
    Black
  } for
} def

8.5 2 div inch 11 2 div inch translate
circles

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Setting n, r, and s to different values gives the different
answersss to this problem.
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C. Business Card
Lots of variations here.