Icon Pack/Icon Changer: Crystal is a icon changer with similar icon masking to theme your unthemed icons:

How to apply this Icon Pack/Icon Changer ?
This icon pack supports a number of popular launcher such as nova launcher, evie launcher and many more. So applying this icon pack is too easy. Follow these steps to apply
1. Open Icon Pack App
2. Navigate to Apply Icon Pack Screen
3. The app shows a list of launcher that are supported such as nova launcher, evie launcher etc. Select the nova launcher installed on your phone to apply icons from this icon pack.
4. The app will automatically applies the icons from this icon pack for nova launcher.

Note: If launcher doesn't show while applying from the icon pack. Please try applying from the launcher itself.

Icon Pack for Nova Launcher
Icon Pack for Apex Launcher
Icon Pack for ADW Launcher
Icon Pack for Arrow Launcher
Icon Pack for Action Launcher
Icon Pack for ABC Launcher
Icon Pack for Evie Launcher
Icon Pack for Holo Launcher
Icon Pack for Lucid Launcher
Icon Pack for M Launcher
Icon Pack for N Launcher
Icon Pack for Solo Launcher
Icon Pack for Xperia Home Launcher
Icon Pack for Aviate Launcher
Icon Pack for KK Launcher
Icon Pack for Nine Launcher
Icon Pack for Blur Launcher
Icon Pack for Trebuchet Launcher
Icon Pack for Unicon Launcher
Icon Pack for Smart Launcher and probably more



DISCLAIMER
You may need a 3rd party launcher to apply the icon pack. If your stock launcher doesn't support icon pack, you can use apps like Awesome Icons or Unicon to change your icons without using a 3rd party launcher.

FEATURES OF CRYSTAL ICON PACK
- 4200+ icons and counting
- Icon masking to theme your unthemed icons
- 40+ HD Wallpapers
- Dynamic Calendars
- Alternate icons
- Unlimited Icon Request
- Icon resolution 192x192px

All the best!