DIY for an above ground pool liner?

Liner for a hot tub or pond/waterfall. Use a a liner for an outdoor soaking bathtub (use a new horse trough).

Weed barrier. Or cut to make a couple of tarps to cover something outside or keep dust off of in garage. I keep a piece of plastic on the concrete when I put lawnmower away as it stains the garage floor. (Let mower cool before you park it on the plastic!)

They make great slip and slides in the summer.

Can make a pond with it

Great for landscape fabric. No weeds will grow through that!

Do you need a tarp over anything?

Maybe make a fountain dig a whole and line it with liner