Rumors have ramped up this week that Apple is developing an “iWatch.” The success of wearable technology like the Nike Fuelband, and demand for the Pebble, the Kickstarter-backed smart watch, have fueled the speculation.

It’s a logical move for Apple, which could use a new device to generate buzz and drive revenue. The iPhone and iPad are still selling almost as fast as Apple can produce them, but it will be hard to sustain growth and relevance by pushing out annual, incremental updates to them.

If Apple is working on some sort of intelligent watch, what exactly would it be? Here are a few concepts to consider.

1. A standalone iWatch

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