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iOS: Crop a photo
Tapping on the last icon to the right in the bottom toolbar takes you to a palette of tools, called Effects, that open up as a virtually stacked color strip selector. The main tool names appear as ink effects, warm & cool, duotone, black & white, aura, vintage, and artistic. Tapping on a strip then gives you more options for editing photos.
iOS: iPhoto adds several more tools
iOS: Pen tools in iPhoto