You can use those iOS apps to build various pieces of pixel art, but if you prefer more intuitive designs, the iPixel iPhone 6 case will allow to you build your own pixel art on the back.
The iPixel is an innovative and fun protective case designed for iPhone 6. As shown in the images, the iPhone 6 case sports an ultra-thin, form-fitting design and durable construction guards your iPhone 6 from bumps and scratches. Most importantly, the iPhone 6 case features a poriferous back, and using its custom app, you can create your own pixel art. After printing the scanned grid card, you can put it in the case to display your love to pixel art. Apart from that, all iPhone buttons and functions are accessible via custom cutouts.
The iPixel iPhone 6 case comes in two colors and is priced at $19.99 USD. If you like it, head to LeeseDesign for more details.