3D Switcher 2 by Coolstar was just released on BigBoss a few minutes ago. It allows you to customize the look of your app switcher with various themes and animations. Here's the description from BigBoss:
Bring your app switcher to the world of 3D with 3D Switcher! You'll never want to go back to 2D again.
7 Modes -
1. 3D Cards
2. Card Deck
4. Inverse CoverFlow
5. Subtler Cover Flow
6. Inverse Subtler Cover Flow
7. 2D Cards (for those who really want the iOS 7 or 8 style switcher)
1. Fade Icons in the Switcher when panning
2. Scale Icons in the Switcher when panning
3. Roll Icons in the Switcher when panning
Configure options from Settings app. **
You can get it for $1.99 from the BigBoss repo!