Tablecloth pad:  Put a the fabric down on the wood table with the waterproof side down and it doesn t slip at all. Then put a tablecloth over that.   No tablecloth slippage and the wood is protected from spills.

Car trunk protector:   Protect your car from various spills and things. 

Under the kitty litter box. Sometimes the cats miss and it works really well for that too.   

Under the newspaper for puppy training.

Tarp alternative for over stacked firewood to keep the rain and snow off.

Under a blanket or towel for diaper-free time

Make your own wet bag. 

Under the tent.

Under a picnic blanket when the dew is still on the grass

Over a splintery picnic table at the park

Make your own changing pad.   Sew it to an XL prefold or a receiving blanket.