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!
200+ DESIGN STYLES
EDITABLE TEXT
FLIP LAYOUT
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? ;)