If it’s still in working condition, put it up in the Free section of Craigslist.
You’d be amazed at how many people will respond to “free”.
Just make it clear that if they flake out on the pickup time you two arrange, it goes to the next one on the list.
Sometimes creative people use them for found art projects.
If there are art college programs nearby, give them a call.
I’ve seen examples on DIY sites of those who make unique fish tanks from dead computers.
I’ve also attended an exhibition of art created from recycled tech stuff. Amazing what some creative minds can come up with. They have to get their raw materials from somewhere. Might as well be some of your useless stuff :)