A few of my favorite masks are:
Dry skin: Chocolate Masque (also for acne), Crystal Masque, and the Dry Skin Mask
Acne/Acne prone skin: Blemish Mud Masque, Strawberry Souffle Masque, Break-Out Mask, and the Whitening Mask (for scars or just an overall brighter complexion
Oily skin: Dead Sea Mud Pac, Ginseng & Jasmine Sauna Face Masque, Cucumber Peel Off Face Masque
Mature skin: Collagen Active Firming Collagen Face Masque, Intense Hydration Hydrogel Masque, Pure Radiance Hydrogel Masque, Revive & Uplift Fabric Face Tonic, Smooth & Define Fabric Face Tonic, Very Berry Face Masque
On the home page of the Montagne Jeunesse website, scroll down a bit and click on the skin guru link. You can then find more specific masques for your skin type, and even the specific ingredients in the masque!