4 pillow with cases sewn together makes one great day mat or roll up sleep over mat, fold under one & make a pillow
Bit of Blue Sky: Pillowcase Mattress Tutorial. For charlottes reading corner
The Craft Mess: Tutorial: Pillowcase Sleep-mats. Used Princess pillowcases for my 4 year old, she loves it!
How to #sew your own nap mat // Full tutorial
The How-To Gal: I Did It! Series: Pillow Pad from Twin Sheet
Sleeping Mats made from Sheets and Standard Pillows
Runs With Spatulas: Crafty Fridays: DIY Pillow Mats. She has more instructions. She also used Ikea duvet cover and pillows. She claims she could make two pillow mats for 19-20 dollars.
Turn those left over or old pillows into Pillow Mattress Beds for the kids or even your pets. They're ideal for sleepovers or family movie nights. Don't miss the Portable Nap Mats and the short video tutorial too!
Here's the tutorial for the pillow mat. It took me awhile to find it since most of the other links were spam.
DIY preschool nap mat cover tutorial with attached blanket, pillow, straps and handle.