Make a Plastic Bottle Chair
Stop!  Don't throw those soda bottles away!  With a little effort, you can actually sit on them!  Here's how:

1.  Gather as many bottles as you can. 

2. Clean and dry them.

3. Tie them tightly together with string.  Make sure the string won't slide off!

4. Test the bottles if the number of bottles is enough to hold you without crumbling.  You can add as many bottles as you want.

5. Cover the whole thing with hemp, jute, muslin (katsa) or any thick malleable fabric like "abaca" so it looks like a small stool. You can even sew matching cloth together as an artsy cover!

Variation: You may use old tarpaulines and sew these together so the bottles fit snugly inside!