Don't know about the technique but those are some cute shoes.
Here is the site the cookies are on. Looks to me like they used frosting sheets.
http://www.rollingpinproductions.com/Baby_Shoe_Cookies_G.htm
Yep- I'd guess frosting sheets. Too cute!! 
I'm sure some kind of stencil would work as well. Not nearly as neat- but worth a try!
You may be able to get the same effect using fondant. Roll your fondant into ropes then criss cross alternate colors, then use your fondant roller to smoosh everything together. Does that make sense? It might not be as uniform as the picture, but it might work.
It says on the website that it's edible Gingham "fabric" so I would agree that it's frosting sheets.
Frosting sheets are thin (paper thin) 8.5x11" sheets that you can run through a printer that has edible ink cartridges...you print the pattern, words, images, etc. onto sheets like you would print any document but then you peel off the backing of the sheet and apply it to your cake, cookies, etc. And it's edible because the sheets and ink are both...well, edible!
I checked CC for the sheets but couldn't find them. Here's one of the first links that came up when I googled "frosting sheets": http://www.kopykake.com/pc_frosting_sheets.html
Good luck!
I would assume that is an edible photo of a gingam background printed on a frosting sheet. You could probably achieve a similar look cheaper by cutting out a fondant piece to fit and paint it using your gel colors and a ruler or waxed paper as a guide.
I don't know whose post it was, but someone said that he/she used a scanner to scan scrapbook paper and have it printed on frosting sheets. I think it was for a baby shower cake.... Sorry, I have been reading so many I can't remember who it was. I will get back with a name after going through my favorites.
Those are soooo cute. Even without the gingham--these would be great for a shower. Whoever thought of the idea did a great job. I agree--looks like an egg cutter. I made easter baskets with the egg cutter--very versatile cutter.
Great looking cookies. Love the idea. You could do that with a stencil and edible pen. That has been cut into lines.
they are adorable! too bad i don't do cookies, but i want to pass this idea onto a friend who does!
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