How about doorstops, or space heaters??? You could use one to prop open a window that keeps slamming shut... You could also convert the LC's case into a litter box and give it a new lease on life. 😀 Since the peecee world used to sh*t on the Mac (and some still do), why not let an animal have it's way with it?? 😀
Of course, you could also go the linux route and turn them into email servers or such. Maybe even an email station (if you can put a high enough OS onto them).
Last of all, you could turn them into modern art, sell them for a bundle and get a new system (or more)... 😀