A "Loonakit" is a ball-shaped bit of adorableness. I've been sewing them for years, and have adapted the ball pattern to all kinds of different creatures, including ponies!
I may have uploaded a pic of this Luna already, but I don't think it showed the cutie mark, so here's a "plot" pic for you all. :D
If you'd like one of your very own, this Luna (or one just like her) is for sale on my webstore, here: http://www.sparkcostumes.com/storefront.php?choice=Loonakit