Colorware is now offering its custom coloring service for the Apple iPad. Customers can choose from a variety of solid, metallic, and pearlescent colors for the device’s back plate, logo, and home button. New 16GB, 32GB, and 64GB Wi-Fi models are available for customization; the company is offering a mail-in service for current iPad owners, as well. Colorware’s new custom colored iPads are shipping in about three weeks from the time of…