Paper

and not only crapy, is immensely shapable and in color variable material and it is possible out of him do virtually anything

Need scissors,staple,glue and all tissue.Crepe paper possibility in color by the help of waters one another in color iron out.

Here's couple of demonstrations totalled according to book.Best model is however nature herself

PET bottles

Scissors and candle.

Various natural materials

Steel wool,pasteboard ,glue,different seeds,spice,peas,bean et al. product of nature.