In each different grade of run (green, blue, red, & black) there is a theme in the Flaine bowl. For example most of the blue runs are named after metals/jewels (e.g. Serpentine, Turquoise, Dolomie, Cristal, Tourmaline, Émeraude), nearly all the reds are diabolically named (e.g. Faust, Méphisto, Belzébuth, Lucifer) and most black runs after stones (e.g. Diamant Noir, Agate, Styx). Most green runs are named after trees (e.g. Mélèze, Pin, Epicea). This only occurs in the Flaine valley though; the other resorts' runs are named separately. However the same names are repeated in different resorts. For example "Combe", valley, is a popular name because of the many runs leading into valleys. Arête, ridge, is also popular.