There's lots of Twilight artwork out there (and much of it extremely good!) but not everyone has the space to display large canvas pieces. I first heard about ACEOs a while ago through my love of fantasy art and these are a superb way to collect lots of pieces of art for less (both in terms of cost and space!)
ACEO stands for art card editions and originals and they are also known by the name ATC, or artist trading card. You can find out all about them and view a great selection of both ATCs and larger art pieces in this web page on Twilight Artwork & ACEOs!
I've started working on several Twilight art pieces myself and have eBay and Etsy stores coming soon. It features a mixture of fantasy and gothic art and includes Twilight pieces as well as general fantasy and ethereal artworks, and is called Ethereal Eclipse Art. Will post more on this soon!