By Jim Karpen
Sciphone Wallpapers (free) offers over 9,000 wallpapers in a wide variety of categories. AND their listing in the App Store promises that an HD version for iPhone 4 will be available soon. The categories include 3D, Abstract, Animals, Cars, Fantasy, Sci-Fi, Fine Art, Food, Funny, Music, Nature, Simple, Space, Technology, Textures, Travel, and many more. New wallpapers are added daily.