Simple. Take your ticket and look at the section, row, and seat number. Make a string out of them with each field 3 characters wide and zero padded. For example, if you're in section 3, row 12, seat 15, you will make this string:
003012015
Now, take this string and run a SHA-256 hash on it (
http://www.xorbin.com/tools/sha256-hash-calculator). For the string above, you get
5f8285b0e74065a68ed141c91fa0b2c8fe57816a171bd3c1fbd4aa26c07f30d3
Take the last 6 characters in the string and make a color triplet out of them (
http://en.wikipedia.org/wiki/Web_colors). So for the string above, the triplet is 7F30D3.
This text is in that color.
Make your t-shirt in your seat's special color and wear it to the game.