I suppose you have me beat there...I rarely make attempts of creating vectors, on any series. I've started one long ago...maybe I should finish it.
You should take a peek at the Lucky Star section at AnimeSuki, they offer a LOT of artworks, fanart, vectors, etc. I joined AnimeSuki JUST for the Lucky Star section...I occasionaly check the Gurren Laggan threads too. LOL
...oh, and you may also enjoy the Raki-Suta imagaboard < Theres a link to a great Kagamin and Konata flash there right now. =w=
...or have you already found your way to those places among others?