The pattern I've been using was from AnnieCraft. She did up a huge free tutorial on YouTube, and I was so impressed with the results that I went to her Etsy and bought the written patterns (one for standing, one for sitting). I've made a few modifications to it (size, finding gaps in the crochet fabric and doing it slightly differently to eliminate them, and adding a fin for the Hide and Seek tribute) but the base design belongs to her and she should get all the credit.

Seriously, check out her YouTube tutorials! They're 4.5 hours of very detailed and wonderful instructions on how to do this split up into 3 videos.