6. DIY Kiddie Pool Ball Pit

Source: WonderBaby

7. 4′ x 4′ Ball Pit

Tutorial at Imgur

8. DIY PVC Pipe Ball Pit

Tutorial at TheNorthwestMomma

9. DIY Ball Pit for Adults

Tutorial at JeffKillian

10. DIY Ball Pit on Balcony

Tutorial at KevinJamesHunt