NFL players are showing their colors this Sunday, taking advantage of the once-a-season chance to support causes at games by wearing specially designed cleats.

Here's a look at a few examples from the Kansas City Chiefs before they face the New York Jets:

AP Photo/Bill Kostroun

Normally, the league hands out fines for shoes with statements of any sort.

But this week, players are allowed to paint messages, and about 1,000 were expected to don customized cleats publicizing charities. 

That would be about double the number who participated a year ago, when the NFL began the effort.

 

Take a look at some examples from Sunday in pictures taken by AP photographers ...

Ravens QB Joe Flacco (AP Photo/Nick Wass):

Texans RB Jordan Todman (AP Photo/Mark Zaleski):

 

Bucs WR Mike Evans  (AP Photo/Matt Ludtke)