To make a very inexpensive, highly customizable shelf out of 'green materials', just visit your local salvage yard.
You will need:
*a saw, or access to one
*several scraps of hardwood flooring, pick colors and finishes that you like, the more eclectic the scrap, the more interesting the shelf, etc.
*{flooring comes in several widths, so pick enough pieces to create the depth you want. If you want a 12" shelf, for example, pick out 4 pieces of 3" wide flooring, and so on.}
*Shelf brackets of some kind
*wood glue
Assemble the flooring on a flat surface, sliding the tongue in the groove, mixing and matching untill you like the way it looks. Once you are happy, take it apart, and put some wood glue in the grooves, and re-assemble. Let this dry, and finally, hang it on our brackets.
This project is perfect for small shelves, like narrow ledges for photos, or collections. You can hang the shelves on small strips of wood hung on either side of a 'nook' or closet too. Here is an example from a previous post of how they can look.
Eating Pop-Tarts, Alice