You can already buy a Samsung Galaxy S6 case on Amazon
Amazon.com: Jeylly Galaxy S6 Case, Samsung S6 Cover, Shock Absorbing Hard Plastic Outer + Rubber Silicone Inner Scratch Defender Bumper Rugged Hard Case Cover for Samsung Galaxy S6 G920 - Turquoise&Grey :
Amazon.com: Phone Case for Samsung Galaxy S6 Edge Folio Flip Wallet Case,PU Leather Credit Card Holder Slots Heavy Duty Full Body Protection Kickstand Hard Hybrid Protective Phone Cover S6edge 6s 6 S
Amazon.com: Samsung Galaxy S6 Edge Plus SM-G928 32GB Black Factory Unlocked GSM - Internatio : Cell Phones & Accessories
Amazon.com: Jeylly Galaxy S6 Edge Case, (TM) [Shock Proof] Scratch Absorbing Hybrid Rubber Plastic Impact Defender Rugged Slim Hard Case Cover Shell for Samsung Galaxy S6 Edge S VI Edge G925 Black/Black :
Amazon.com: DIY Phone Case for Samsung Galaxy S6 Edge, Create Your Own Customized Phone Case, Personalize Phone Case by Yourself : Cell Phones & Accessories