Here's all of the Background Girls from Equestria Girls.

Athletes:
-Cloudy Kicks
-Tennis Match

Rockers:
-Cherry Crash
-Mystery Mint

Fashionistas:
-Aqua Blossom
-Rose Heart
-Blueberry Cake

Dramas:
-Golden Hazel
-Watermelody
-Sophisticata

Techies:
-Velvet Sky
-Scribble Dee

Eco Girls:
-Paisley
-Sweet Leaf
-Starlight

Thanks to SelenaEde for the bases:
https://www.deviantart.com/selenaede/art/EqG-Cloudy-Kicks-Base-02-396594782
https://www.deviantart.com/selenaede/art/EqG-Cherry-Crash-Base-01-395247335
https://www.deviantart.com/selenaede/art/EqG-Mystery-Mint-Base-02-395258672
https://www.deviantart.com/selenaede/art/EqG-Golden-Hazel-Base-01-395894743
https://www.deviantart.com/selenaede/art/EqG-Velvet-Sky-Base-01-404590229
https://www.deviantart.com/selenaede/art/EqG-Paisley-Base-02-395167048
https://www.deviantart.com/selenaede/art/EqG-Watermelody-Base-01-395878554
https://www.deviantart.com/selenaede/art/EqG-Aqua-Blossom-Base-02-396229761
https://www.deviantart.com/selenaede/art/EqG-Rose-Heart-Base-02-396229650
https://www.deviantart.com/selenaede/art/EqG-Scribble-Dee-Base-01-404590387
https://www.deviantart.com/selenaede/art/EqG-Sweet-Leaf-Base-01-395177672
https://www.deviantart.com/selenaede/art/EqG-Tennis-Match-Base-02-396594562
https://www.deviantart.com/selenaede/art/EqG-Sophisticata-Base-01-396120869
https://www.deviantart.com/selenaede/art/EqG-Blueberry-Cake-Base-01-396363393
https://www.deviantart.com/selenaede/art/EqG-Starlight-Base-02-395149451

The Background Girls belong to Hasbro and DHX.