Instagram alternative for iPad
Process is my darling at the moment for iPad capture, edit, post and is most similar to the workflow for creating content comparable to Instagram.  It lacks the hosting and discovery aspects of the former, but has much more serious editing capabilities and is more like a Photoshop than an iPhoto for iOS.

I also do use the normal camera regularly in combination with iPhoto and/or Snapseed for certain types of edits and sharing.