Hi Gerardo,
In "Creating Origami" there are several models that might fit-the-bill
for you. You can see images of all of my models on Gilad's website.
http://www.giladorigami.com/BO_Creating_Origami_Nolan.html
Most of the "decorations" are color-change and square, all of the
"Colored Lover's Knots" can easily be square by just moving a single
flap behind each point (it's obvious that to do if you are holding the
model) and many of the "Seven Simple Bracelets" are rectangular before
you make them into a loop.
However, none are on the web as you mentioned, just in the book. E-mail
me directly with more info about your project and I could possibly post
them on the web for you.
-- JC
