I don't know if you have any NOTP or characters you don't write but here, have some pairings:

Dean/Blaise
Dean/Seamus
Dean/Ginny
Draco/Luna
Draco/Ron
Draco/Ginny
Harry/Daphne
Harry/Astoria
Harry/Neville
Neville/Hermione
Neville/Luna
Ginny/Luna
Tracey Davis/Susan Bones

Tonks/Charlie
Tonks/Bill

Bellatrix/Lucius
Narcissa/Lucius
Narcissa/James
Narcissa/Severus
Narcissa/Kingsley
Narcissa/Lily
Lily/Sirius
Sirius/Severus
Sirius/James
Marlene McKinnon/Emmeline Vance
Marlene/Dorcas
Marlene/Sirius
Marlene/Regulus

James/Ginny
Severus/Ginny
James/Hermione
Sirius/Hermione
Regulus/Hermione
Rodolphus Lestrange/Hermione