Most artist's who sell on Etsy know what a "Treasury" is. If you are not an Etsyian, it is just a group of items for sale on Etsy you pick out that you like. It can be items of the same color, or the same theme. You should not pick out items from your own store! It does help to promote your fellow artist friends or just your favorite artists you have met on Etsy. It is sure to help out with the number of views they get and maybe even help with some sales!