This instructable is a basic version of Bley Joel's ("It's nine o'clock on a Saturday, the regular crowd shuffles in") Solar Shield, and it should work for most arduinos.  I've tested it with SparkFun's Arduino Pro, and the new Leonardo.

Myself and the other Solar Pocketeers* are actually waiting for a new set of PCBs for an advanced version of this solar shield to arrive on Wednesday Sept 5 (in 4 days), but being impatient, here is a version of a direct-power solar shield that doesn't require a PCB.  You read that right -- PCB-free shields!  Any rigid backing -- a thin piece of acrylic, a breadboard, an old empty circuitboard, a discarded Muji plastic pencil holder, even-- any of these will work as the backing for the shield.  Some drill holes, a bit of copper tape, and some supergluing and you should be on your way to a lovely solar shield that is sure to win you lots of friends.  And a minor amount of lost fingerprint fidelity.

I've included a basic set of templates for cutting the backing and the copper tape (for the two electrical connections you will need to make between the pins of the shield and the positive and negative of the series-connected solar cells (also known as "solettes", since they are tiny and cute lasercut solar shards)).  Those two items and a supply of solettes and you can be off to the solar races.

Time to complete: an hour
A wee bit of soldering required
Difficulty level:  Pretty easy, but you will likely break 4-5 solettes at first.  It requires a bit of a delicate touch.
Usefulness:  To be determined

*First, I promise to never use the term "Solar Pocketeers" again -- but better me than someone else.  Second, this is the 6th entry in the Solar Pocket Series of projects that Alex (this guy) and I are posting over the coming weeks.   For more about Solar Pocket Factories and DIY solar check out our in-progress Kickstarter campaign (Aug 15 - Sept 14):  http://www.kickstarter.com/projects/alex9000/the-solar-pocket-factory-an-invention-adventure/posts/303802

Here's what it's all about in just over a minute:

Step 1: What You Need

++ Soldering iron and solder for just a couple joints.

++ A drill press with a ~1.5mm diameter bit

++ A rigid backing of some sort; I used an old non-functional circuitboard, but anything a few mm thick and rigid will do.

++ Copper tape (single-sided adhesive):  This is easy to find at most hardware or electronics shops.

++ Printed templates (next step)

++ 11 solettes:  these are small pieces of monocrystalline or polycrystalline PV silicon that are typically hidden under an epoxy blob in off-the-shelf panels.  You need the raw stuff for this instructable.  Available a few places on eBay or via our Kickstarter page here:  http://www.kickstarter.com/projects/alex9000/the-solar-pocket-factory-an-invention-adventure

++ High temperature superglue aka cyano: the thin stuff, like crazy glue.  The gels don't work well.  The off-the-shelf super glues will work, but for a more reliable panel you will need high temperature cyano, since most basic cyanos breakdown at 80 degrees C (which is a bit on the threshold of what your panel could experience in a bottle sitting on your porch).  I used Aron Alpha 401XZ, which gets to 120C.

++ Four headers, available at many online arduino-friendly shops.  Like, here

++ Encapsulant:  This is not necessary if you are just experimenting, but if you are going to put your solar shield outside or plan on using it for a number of projects, you should encapsulate the panel.  Bartop or 5-minute epoxy will work for this, but better encapsulants are PU designed for doming and high-end solar applications (like solar cars); and another great method is EVA laminate with glass. 
neat idea! but doesn't the arduino need 7-12V? this is a 5.5V supply right?
<p>The Arduino only needs 7 volts minimum when you hook it to an adapter/battery instead of using it's 5v usb-port. That is because the voltage regulator on the arduino has a voltage drop of 2v. So when your input is 7 volts the 2v voltage drop makes it 5v.</p>
<p>the Arduinos I have run off of 5 volts. They run off of the USB port which is 5 volts. They can take a higher input voltage because they have a voltage regulator built on board.</p>

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