Welcoming 2019 Pi day: How to draw the letter π?

Here's one with \shapepar, with great thanks to flowframtk.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{libertine}
\usepackage{shapepar}

\newcommand{\sep}{\discretionary{}{}{}}

\begin{document}

\small%
\shapepar[1.00375pt]{{137.821777}%
{0.0}b{27.0}%
\\{0.0}t{27.0}{249.0}%
\\{11.955168}t{14.0}{250.0}%
\\{23.910336}t{2.0}{249.0}%
\\{27.074219}t{0.0}{135.5}st{135.5}{111.5}%
\\{35.865504}t{57.0}{35.0}t{179.0}{35.0}%
\\{47.820672}t{56.0}{34.0}t{178.0}{34.0}%
\\{59.775841}t{55.0}{34.0}t{177.0}{34.0}%
\\{71.731009}t{53.0}{35.0}t{175.0}{35.0}%
\\{83.686177}t{52.0}{34.0}t{174.0}{34.0}%
\\{95.641345}t{51.0}{34.0}t{173.0}{34.0}%
\\{107.596513}t{49.0}{35.0}t{171.0}{35.0}%
\\{119.551681}t{48.0}{34.0}t{170.0}{34.0}%
\\{131.506849}t{47.0}{34.0}t{169.0}{34.0}%
\\{135.137695}t{46.0}{35.0}t{168.0}{35.0}%
\\{143.462017}t{45.0}{35.0}t{168.0}{34.0}%
\\{154.276367}t{44.0}{34.0}t{166.0}{35.0}%
\\{155.417186}t{44.0}{34.0}t{166.0}{35.0}%
\\{163.378906}t{43.0}{34.0}t{166.0}{34.0}%
\\{167.372354}t{43.0}{34.0}t{165.0}{35.0}t{256.0}{3.0}%
\\{171.936859}t{42.0}{34.0}t{165.0}{35.0}t{253.0}{8.0}%
\\{179.327522}t{41.0}{35.0}t{165.0}{35.0}t{248.0}{13.0}%
\\{182.050781}t{41.0}{34.0}t{165.0}{36.0}t{245.0}{15.0}%
\\{187.185547}t{40.0}{35.0}t{166.0}{36.0}t{240.0}{17.0}%
\\{191.28269}t{40.0}{34.0}t{166.0}{39.0}t{235.0}{19.0}%
\\{193.214996}t{40.0}{34.0}t{166.0}{40.0}t{232.0}{20.0}%
\\{197.688477}t{39.0}{35.0}t{167.0}{50.0}jt{217.0}{31.0}%
\\{198.388672}t{39.0}{35.0}t{167.0}{80.0}%
\\{203.237858}t{39.0}{34.0}t{169.0}{72.0}%
\\{207.880219}t{38.0}{34.0}t{171.0}{64.0}%
\\{207.958008}t{38.0}{34.0}t{171.0}{64.0}%
\\{215.193026}t{37.0}{19.0}t{175.0}{49.0}%
\\{215.660156}t{37.0}{18.0}t{176.0}{47.0}%
\\{222.195312}t{37.0}{2.0}t{186.0}{23.0}%
\\{222.195312}e{37.0}%
\\{223.362305}t{191.0}{13.0}%
\\{223.362305}e{191.0}%
}%
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\end{document}

Some tessellated pi...

This one is done in plain Metapost, so compile with mpost.

prologues := 3;
outputtemplate := "%j%c.eps";
input colorbrewer-rgb;
beginfig(1);
    path pi; numeric t; t = 13;
    pi = (origin -- (5,0) -- (5,1) -- (4,1) -- (4,4) -- (3,4) -- (3,1) -- (2,1) -- (2,4) -- (1,4) -- (1,1) -- up -- cycle) scaled t;

    for i=1 upto 48:
        for j=1 upto 48:
            fill pi                              shifted (4t*i-2t*j, t*i+5t*j) withcolor Spectral[7][i mod 7 + 1];
            fill pi rotated 180 shifted (4t, 5t) shifted (4t*i-2t*j, t*i+5t*j) withcolor Spectral[7][(3+i) mod 7 + 1];
       endfor
    endfor
    clip currentpicture to unitsquare scaled 100t shifted (0, 32t);
endfig;
end.

You will need to load Metapost Colorbrewer for the colours...

Writing π with the digits of π - using the verbatim environment.

\documentclass{article}
\linespread{0.7}
\begin{document}
\begin{verbatim}
     3.141592653589793238462643383279
   5028841971693993751058209749445923
  07816406286208998628034825342117067
  9821    48086         5132     
 823      06647        09384
46        09550        58223
17        25359        4081
          2848         1117
          4502         8410
          2701         9385
         21105        55964
         46229        48954
         9303         81964
         4288         10975
        66593         34461
       284756         48233
       78678          31652        71
      2019091         456485       66
     9234603           48610454326648
    2133936            0726024914127
    3724587             00660631558
    817488               152092096
\end{verbatim}
\end{document}

Based on ascii art drawing by Jorel - https://www.flickr.com/photos/jorel314/3352784321/