Before making this, I figured out what people (9+ years) use a lot nowadays and I came up with: cell phones and mp3 players.
A lot of people waste energy using these two items by buying the speaker systems for their mp3 players and charger their phones. Both uses usually end up with leaving the charger or system plugged into the wall, which is a big big waste of electricity.
So I developed a simple, green and cheap solution that everyone can do. This whole instructable can be made with recycled materials around the house, as long as you keep broken stuff like I do. If you don't that's totally okay, but you will have to order/go out to buy a few things.
Depending on your experience, it should take about 1.5hours for full assembly.
The black charger below is one that I made for me. I like the color black and I designed it based on what I like. I think that it's better to design something that you like and that you can put in you're own creative input into. So, I'm going to show you the basics on how to build one and I'm going to leave it up to you on how it looks. Have fun with it.
By following this instructable step by step you will have charger that looks like the white one pictured below
Step 1: Tools and materials
Multimeter (not shown)
Crazy Glue (not shown)
5 Volt Regulator
4 AA Rechargeable batteries
4 AA battery pack holder
1 An iPod box
1 Speaker (not too big, it needs to fit in the box along with other materials)
2 Solar powered outside lights
1 USB plug (female)
1 set of old head phones
You can buy these all brand new if you'd like. I used all recycled materials for the black one pictured on the intro page. This white one is almost all recycled except for the USB cord.
If you'd like to find these parts around the house here are some places to look:
An iPod box - this doesn't need to be an iPod box, it could be anything you want, as long as everything fits. Have fun with this, it's for you so make the box something you like.
Volt Regulator - I found mine in a broken laptop. Most electronics have volt regulators, you can see what kind of regular it is by typing the number on it and google searching it. It does take time to find, if patience isn't your thing, you can probably pick one up at Radioshack for $2.
AA Rechargeable batteries/Solar powered outside lights - These were gotten together and considered recycled because they were broken (not the solar cell, but the light were broken from their base)
AA battery pack holder - These are found in a lot of toys. Mine was taken from a remote controlled car.
Speaker - I got mine out of a broken printer. You can also use the ones from those singing cards or a broken laptop.
USB plug (female) - this is really hard to find, but they can be found an pulled out of laptops.
head phones - I used a set of headphones that busted on one side.