Made entirely of plastic, Trident's Apollo Case for iPhone 5 ($30) allows users some customization in the form of swappable backplates. The body consists of front and back covers that snap together around the iPhone's edges, while leaving all the buttons and ports completely exposed. Apollo comes with one matching plate and a second complementary one, while packs of five extra plates can be had for $17. Included with the case are screen film, a cloth,…