Here's how they look all snug on the crib mattress:
I made them to coordinate with the peek-a-boo crib skirt (above) and valence (below) that I also made for the nursery.
Fast forward two years and here they are as a fitted sheet on his toddler bed. (Toddler beds use the same mattress size as cribs so you'll be able to use these sheets for a long time.)
If you're interested, I also have a tutorial to make your own toddler-size flat sheets, like this:
And I have a tutorial to make your own pack-n-play sheet, like this: