Really, if you want grist for the shipping mill out of official μ's material, head for the School Idol Diaries, either the light novels or the manga. (The manga is here, so that's probably easiest to get to.) You get the usual pairings — NicoMaki, NozoEli, UmiEli, KayoRin, the usual combinations of the second years — plus some relative novelties, like NozoRin, MakiUmi, HonoNozo, or EliNico.