Make your brochures their own box. See my instructable: make your own boxes! Recycle some cardboard, make a box that fits perfectly, 2 problems solved. Cman
cut an angle across an orange juice carton that has been rinsed very well it is waterproof and you could screw it to something to hold it it could be painted for a better look as well
I usually lay my brochures down flat, in a wicker or plastic basket. I just go to the dollar store with one of the brochures and find a basket that it fits in. Some of the wicker baskets I've found are such a perfect fit it's like they were made for it. You might also try craft wire. It's very easy to bend into a 3d structure. Just think about the basic outline of the object you want to build and piece together the edges and corners, making a frame. Then fill in the "walls" with colored yarn, paper, or more wire. It's not easy to explain without pictures, but you could learn the process easily by grabbing a roll of craft wire and playing with it for an hour.
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... Ok, fine... You can use used flat rate boxes...