This is a pretty straightforward theme: show some kind of checkered or grid pattern in your icon. The pattern can be there in the source, e.g. someone wearing a plaid shirt or standing in front of a wire fence or playing a game of chess, or you can add it using textures.

( Some inspirational material under here )

* You can make as many icons as you like (if you need a goal, five is a good number :))
* There is no minimum, 1 icon is enough to enter this activity
* Please submit your icons (and URLs!) to this post, all in one comment (if possible)
* Everyone can participate, you don't have to be a member of this community

* I will collect all the icons from the comments and make a result post
* Everyone can leave comments on the inspiration and activity result posts
* There is no voting

Deadline: Saturday, October 18th, your end-of-day