or maybe an 'art' project?

Speaker, microphone, circuit board, screws, LED's .....

..... equipment that are totally worthless.

Depends on the model I suppose.

A example :

https://telephones.att.com/telephones/cordless-telephones/push-to-talk

One of ours has been on the fritz.

Give them to somebody who wants them.

You will just have to let your conscience be your guide. Perhaps you would feel guilty about putting them in the garbage, but you would feel even worse about keeping the useless things. Like I said, let your conscience be your guide—just my opinion.

But I included the base station, batteries, and everything needed to make them work.

Toddlers love to talk on the phone and push buttons.

We just check our local Patch: https://patch.com/ for the next electronics drive. It usually benefits some organization and we get rid of junk! Good luck!