Picture of Laser etched glass coasters
If you have access to a laser cutter, these coaster make great gifts.  They're easy to personalize and quick to make.  I made it at the TechShop in San Francisco.

You'll need:

* Access to a laser cutter
* Blank glass coasters (I used Ikea Joker candle dishes)
* Painters tape
* Blank newsprint or butcher paper

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Step 1: Design coasters

Picture of Design coasters
You'll need to design your coasters using vector graphics software like Adobe Illustrator or CorelDraw.  You can use the attached file as a starting point.

Start by outlining the coasters with the correct size circle.  You may also want to mark out the lip of the coaster as a reference while you're designing.  Then create your desired graphic.  Reflect the graphic across its center so you can etch onto the back of the coasters and flip them over.  After reflecting, double check that your work is still aligned correctly.  Finally, copy your work in a grid so you can etch multiple coasters at once.