4. InstaMag (get it here)
instamag.jpg CREATE STYLISH COLLAGES! Collage will never be generic again!
InstaMag V2.5 now comes with 2 powerful collage modes: MAGAZINE STYLE and MODERN STYLE!
Choose from 200+ elegantly designed styles and instantly create Magazine-Style collages that look better than other collage apps!
Industry’s FIRST of its kind. MODERN STYLE allows up to 12 photos, and over 10,000 possible layouts!

You might want to read: BitStrips Cartoon App

5. Pix Shape (get it here)
pix-shape.jpg An innovative photography app. It seperates your photo in foreground and backgound by different masks. These masks support user-defined blur radius, filters, colors and transparency. Rotation,scale,and movement of  your photos can rendering the final effects in time. You can create emotional and style photo effects very quickly.

  • You can select your favourite mask style from 130 shapes in 6 categories.
  • You can adjust blur radius, color and transparency of your mask.
  • You can apply different filter effects on foreground/background respectively.
  • You can input text in different fonts/color/transparency or shadow effects.
  • You can create your own stickers by cropping any shape of photos to have  creative collage styles.

Cool Photo apps for your iPhone, right? ;)