I have been wanting to make one of these for a really long time. Finally I decided to go for it and make one for my daughter's birthday.
I think it turned out nice. I love the bright polka dot canvas. What I didn't like is that it took sooo much stuffing. I still need to put about 4 more bags in this thing. It is good for her though. I used the shredded foam that I bought at my local craft store vs the pellets because I wanted it to last longer and be more cushy.
I wanted to make a large one so that she could grow into it, or so that her dad could read with her on it. I used the adult size free pattern from Michael Miller's blog.
The pattern was really easy, and I only altered two parts of the pattern. I put in a 22 inch invisible zipper instead of the velcro. I also made the circle applique much larger. I took a large plate and traced it, then added an inch or so to that. I am not really sure what measurement I ended up with. My daughter loves it and especially loves jumping on it. I sure do hope it holds out through all the rough play. At least she is really enjoying it.