Squared Brochures question, please help

Hi guys, do you know if there is any standard size for square brochures?

Can i use any size i want?

Hi UnitedStars

Here you can download Brochure Template in many format, especially PSD from UPrinting. When you already visit the site, go to Template tab. All size is Standard for Printing.

Enjoy

my bad, i mean trifold square brochures like this one http://graphicriver.net/item/square-trifold-brochure-mockups/2647523?WT.ac=search_thumb&WT.seg_1=search_thumb&WT.z_author=Genetic96

i think uprinting dont have that kind of brochures