Did a quick search for CMYK, CYMK, and YMCK.

Here's what I found:

About 86 different designs.
These were divided into five categories:
LETTERS: 14 (16%). The shirt says CMYK, and not much else.
ABSTRACT: 20 (23%). Designs whose main point is that the colors mix.
YMCA: 5 (6%). References to the song.
CLIP ART: 16 (19%). Usually black vectors with CMY! splashes or drips.
ILLUSTRATION: 31 (36%). A significant part of the design appears to be drawn. It's sort of a loose category.

The highest score: 2.90 for


The lowest score: 0.88 for


The Average Scores:
For LETTERS: 1.62
For ABSTRACT: 1.56
For YMCA: 1.84
For CLIP ART: 1.74
For ILLUSTRATION: 1.8
OVERALL: 1.71

And here are some (not all) of the designs. (Some fit in more than one category, some don't really fit any. It's not an exact science.)

LETTERS:





ABSTRACT:






YMCA:





CLIP ART:




ILLUSTRATION: