Particle Photon and Adafruit's Particle/Spark NeoPixel Ring make a great combo for this pin, creating the perfect platform for a planet. Notice the plastic button which allows for any photo insert. Although I've included a battery, that's really just for showing off to a class or friends for an hour. You'll really need to have a USB battery pack and cable if you want to wear it in your fave wifi zone for an extended period of time.

Supplies:

• Particle Photon With Headers
• Adafruit Particle/Spark NeoPixel Ring Kit
• USB Cable A/MicroB 
• LiPoly Battery (optional)
• Adafruit LiPo Micro USB Charger (optional)
• USB Battery Pack (you probably have one at home)
• Magnetic Pin Back
• Adhesive Velcro (found in craft stores)
• Black Construction Paper
• White Paper (decent stock for printing Earth image)
• Solder

Tools:

• Soldering Iron (with small tip)
• Diagonal Snips

Make sure you've taken the time to thoroughly go over the guides for:

• Particle Photon (on Particle's site)
• Adafruit NeoPixel UberGuide