Diagonaly griddy pattern

Each small square represents a number from 1 to 10,000, colored as follows:

• gray = two digits are the same ("ape", for "a pair")
• brown = first and last digit are the same ("bookends")
• blue = three digits are the same ("feathers", for "three-of-a-feather")
• light blue = four digits are the same
• green = two pairs of digits are the same ("frog", for "two pair, fine as a frog's hair")
• magenta = number is a palendrome

I made this for the Count to a Million thread on the (unofficial) New XKCD Forums (posted on page 327), where people often write certain words whenever these patterns come up. I made this using a Perl program, then increased the size with Gimp. You can also see this as a table or with an alternate color scheme.