Have a look at this amazing webpage where it is possible to visualise the first 4 million digits of Pi as a multi-coloured mural:
http://two-n.com/pi/
Not sure how they came up with the colours for each digit (5 light blue? For me, fives are definitely yellow!).
Draw your mouse across the page to pick out all kinds of number sequences.
What's the most beautiful pattern you can find?