Sketchy: Design Your Own Samsung Galaxy S4 Case Black. ketchy by Devicewear for the Samsung Galaxy S4. Does your best thinking happen when youâre doodling? Would you rather design your own case than buy one someone else made? Let your creative juices flow with the Sketchy case for the Galaxy S4. With a clear-backed case and blank inserts, you can create a new design anytime you want. The case provides sleek protection in a semi-flexible case so y