These here are some of my favorites: South Dakota, Washington, Maine/Meta, and C.T.
South and Washington are both fairly standard fare: Repainted versions of regular old Spartan 2 (South is a complete repaint, Wash is a "Steel" Spartan that was a bit of a pain to get)
Maine, however, is a bit of a mismatch. My current "standard" version of him features the EVA helmet and chest-plate, EOD right shoulder, and CQB left shoulder. This doesn't really match any of the current seasons, but since there's not yet a Scout chestplate I can't yet do his S6 look. I do, however, have an EVA Right shoulder to complete his look from Season 8 (seen in the third pic).
C.T. is probably my favorite of the lot. Again, she's not really accurate to the show, as her armor pieces are from Season 9, but the Helmet is not all-brown, as it is there. This is more a personal thing... with Season 9, they opted to include Halo 3 armor pieces, but to keep the secondary color as it appears in Halo 2... which is fine, but the EOD helmet always has the white on the sides like that, even you have both primary and secondary colors as brown. Instead, I opted to approximate what the helmet would look like based on how the secondary color looked on the Mark V helmet in Halo 2.