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grommetted holes at the four corners. yeah, i got nothing.

How about using a REALLY large stitch on the seams?One normally uses about 7 stitches to the inch for this kind opf sewing. Maybe making the stitch as large as it can be would help. Or, cut one side in half and use an overlapping closure. If you use buttons, or snaps or small runs of velcro, that would let the air out.

2 words: Whoopee cushion!

You could go with grommets, or you could take off the tablecloth material on the bottom and re-back them with a breathable cotton (like a duck or twill, maybe in a nice complementary pink) so you wouldn't have that problem.

OR make them into box cushions with pink on the sides.

Does this remind anyone else of those squishy toilet seats? My grandma used to have one of those and it drove me crazy... who wants that sensation when you're,um, otherwise engaged?

There are little vents you can buy to insert in the fabric, kind of like a grommet insertion, but they aren't big holes. Check out an upholstery supplier.

There are specific grommets made just for this application - rather than a large hole in the middle, they look more like a tea strainer with lots of little tiny air holes.

Of course you'll have to take the pillow apart to put it in, but this will make a big difference.

You might also try making them with a zipper -- zippers aren't air tight.

What if you just poke a few pin holes in the fabric near the seams? The fabric is plastic coated, so it won't fray.

pin holes are easiest and won't show , trust me.

I was going to say pin holes, but I think small grommets at the corners would be better looking

What bepsf is describing is called a "breather button" we use them when we have either leather or outdoor fabric cushions made. You can look online for these although I don't know if the technical name is "breather button", but you may want to stop by a local upholstery shop and see if you can buy a few from them.

I do agree that with pillows I would probably add a zipper instead. You would notice it less than anything else.

will pin holes work, or will you still have the slow deflation?

I'm so lazy and unwilling to tear things apart and redo, I'd probably just snip 'em with scissors in two corners and then consider the other side the "front".