Something I have wanted to do is take an old laptop, convert it to a desktop, create a case for the screen and motherboard, wall mount the case, add a device like a leap motion for touch controls, and use it as a smart home control panel and/or a fancy weather clock with apps installed for sticky notes, photo album, etc.
Unfortunately the newest laptops you have are just a generation shy of meeting the minimum cpu requirements (AVX instruction necessary) for the leap motion in particular, but there may be alternatives.
I also suggest turning them into emulation boxes.
Dirt_Owl: Oh hi, how are you holding up? BECAUSE I'M A POTATO. slow clap