More to explore:
bench seat cushion tutorial
Corner bench IKEA hack
How to Upholster a Bench Seat Tutorial
baby stuff that is GENIUS! by carlasisters
Piped Bench Cushion
DIY Storage Bench. This looks really simple, I could probably do it myself without help...and would be a great idea for more storage and its a cute idea for window seating! Just make a pillow seat for the top
How To Upholster a Bench: A Step-by-Step Tutorial That Makes It Easy!! (including corners, and using hot glue!)
Great tutorial for bench cushion. And she uses shower curtains for fabric, which is genius.
Simple Ideas That Are Borderline Genius (part 2) - from DumpADay
Bring shower curtain to beach to make pool for little one....genius!