Freezing green beans (or any veggie) is very easy to do. It is an economical way to be able to enjoy your garden in the dead of winter. So don't let those extra beans spoil and don't give them to the neighbors - freeze them!
Chop beans into uniform pieces.
Blanch in steamer for 3 minutes.
As soon as the 3 minutes is up, plunge into an ice water bath.
When cold, drain and spread out on a cookie sheet. Put in freezer. You can skip this step and just pack into a freezer container, but I like to do this so they are frozen individually and not in a clump - that way you can pour out how much you want at a time.
Pack into freezer containers, label and put in freezer. You can use Freezer Bags or sturdy plastic containers, but I am trying to avoid all use of plastics - so I freeze in glass canning jars.