What colour bin does styrofoam go in?

It's usually green. If your community provides a roadside Styrofoam recycling plan, you can put the waste Styrofoam in the green recycling bin, but in some places the recycle bin is blue, and there are usually marks on it, so you can know before throwing it.
If your community does not have a roadside Styrofoam recycling plan, you can bring your bubble to the recycling center.
Read more about Styrofoam recycling:
Styrofoam Recycling Project