okay.... I'd like a Halloween pic with some of my fav pairings (or at least one of them, since there are a lot and it would be too much work for you!)
Most of all I like GrimmNel and GinRan (Bleach), Zutara (A:TLA), ShikaTema (Naruto), SaNami (One Piece) and some others, but they aren't popular so you might not know those guys... so.... how about GrimmNel and SaNami cosplaying each other? If that's too much, draw only GrimmNel cosplaying as Sanji and Nami or as Zuko and Katara^^
If you have lots of time and inspiration, how about Espada Halloween party? With GrimmNel, of course, since it's my most fav pairing ever! Dress all of them as you like, no limits to your imagination... and if you don't want to draw all Espada members, take those ones which are in Akatsuki Gakuen, they're the coolest imo^^
if I ask too much, you can always send me your *coughnudecough* photos ^_~