There are several in app purchases for different kinds of brushes, inks, water color like effects, etc. However, the basic app may get you so hooked you won’t mind splurging for the few extra dollars to get the wide variety of pens, brushes, and inks.
New in Paper 1.3.1
• MADE WITH PAPER—Find inspiration in this feed of fresh ideas from creative minds around the world.
• ZOOM—Get closer to your ideas. Pinch to bring up zoom without losing your place.
• INK UPGRADE―Our Expressive Ink Engine™ is now built on OpenGL for faster rendering.
You can watch the app in action below.