Chop the Styrofoam into little pieces. Place in glass bottle. When the time is right, add gasoline. Now you have napalm. Rag for wick./s <-- this means I'm just kidding and you should never, ever do this or throw it at fascists.

Donate to a local food bank, homeless shelter, meals on wheels. Styrofoam containers can be used to store or transport hot or cold foods to those in need.

Donate to food banks or post them up for sale on Craigslist for $5 each. They're kind of expensive these days and fishermen/campers frequently want them.

Soundproof your sex dungeon?

A quick check at amazon shows these costing about $14 each, no doubt much less in bulk but still expensive. Perhaps inquire with the shipper if they would accept them for reuse if cleaned. If the shipper is friendly they might consider setting up a program to collect these from your city and return them for reuse. The shipper could save considerably on costs and you might have found a new business.

Homemade flammable gel.

I agree with charity and giving them away as a first priority. However, have you considered building an igloo?

Start harvesting organs.

I agree with contacting local charities (kitchens, food banks, etc) and see if they can use them.

frustrating. I was also getting a steady supply of ice packs. One time one of the ice packs said it could be used as plant fertilizer and I was happy to do so but never saw another one like that.

I take my trash to a transfer station. The amount of single-use stuff we throw away is frightening.

I never came up with an answer. I asked my neighbors on an app and they had similar issues with chilled medical delivery.

Everyone is out here telling you to sell them for $x meanwhile I'd suggest just giving them away for free to anyone willing to pick em up. No compromises.

Make a cool boat

Make some styrofoam swamp coolers. My AC is not catching up this summer and I have a few of these due to some eyedrops I've been getting shipped to me. I'm seriously considering building one until I get my AC serviced when it gets cooler.

Depending on the density of the Styrofoam, it can be used as a rainfall simulator for a greenhouse. Water drips through some Styrofoam in a very random way.

Home igloo?

Make a raft

Put meals in them and give them to the unhoused?

As someone with cystic fibrosis, I've got the same problem but once a month. So much packaging. And then if you need a port for two weeks? Here's your lifetime supply of materials.

You could keep them to pack your own food into encase of a power outage. I assume this nest together so they wouldn't take up much room.

Likely not something you will do but I found this interesting: There is an electronics business in the UK who bought a machine to break up styrofoam into small bit. They also have a steady supply of the stuff. They paid for the machine by selling the styrofoam as blown-in insulation.

If they are the right kind of Styrofoam, they can be recycled. See if there's someplace near you that takes them.

organ harvesting

Can we convert Styrofoam into something you can sell? Maybe you can injection mould it somehow and sell figurines?

You can use them as incubators for little plants in the spring to keep them warm at night if you’re in a cold place. Or if you want a fun project build a cloud chamber and watch particles move.