The best replacement for styrofoam is paper.

The best alternatives to styrofoam are rated as following:
★★★★★  paper
★★★★  plastic
★★★★  polystyrene
★★★★  paper cups
★★★★  fiberglass insulation
★★★  plastic cups
★★  styropor
★  paper plates
★  bubble wrap
★  cardboard
★  paper coffee cups
  foam board
  polystyrene foam
  tyvek
  polyurethane foam
  perlite
  styrofor
  balsa wood
  paper cup
  styrofoam
  balsa
  styropore

Your alternative for styrofoam is not listed? Suggest!
Speaking about styrofoam, one probably shouldn't forget about acetone.

Other search terms related to styrofoam and their ratings are:
★★★★★ acetone
★★★★★ stucco
★ cement
concrete
it melting
You have in mind a companion for styrofoam and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of styrofoam in all years. Click on graph for more.
styrofoam
paper
plastic