Bit of Whimsy Dolls, for this mermaid doll. Bit of Whimsy sells easy sewing patterns for a variety of toys and small dolls; I whipped up this doll from my scrap bag on a snow day. It took about an hour.
Bit of Whimsy has a lot of great patterns; I want to try the Jane doll next. She's designed to look like a Jane Austen-type Regency lady, but also looks relatively easy to sew. I'll let you know how it goes!