Instructables
Picture of What a silly hat!
This is a silly hat! Just a fantasy with a few LED's a bit of cloth, and a chip lying around.

Fashionable words:

Modifying a hat.
Personifying mass production.
Hand-made: sewing and soldering and programming.
DIY: well, I didn't make the LED's nor the chip, nor the pieces of cloth, the batteries, the rest, yes..
Recycling discarded LED's, the red ones, not very bright, i always recycle parts....
Bling: adding some bright LED's and two hand shapes made with a lasercutter.

Difficult?
Yes and no:
yes because of the different things you have to do: sewing, programming, soldering all a bit from incompatible domains.
no: this is not String Theory, it is rather normal stuff on all levels.

Fun:
YES: this is an invitation to make your own versions and explore further, you can add all the things from your bag of tricks!

Video:
These few very bad shots to prove that it works. Filming LED's is somehow difficult business with my cheap digital camera :-)
http://youtu.be/KgDTlvQoyvY
 
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Step 1: Tools needed

Electronics
Pinchers
Soldering device

Sewing
Sewing machine, needles, scissors

Programming
Programmer, laptop with either AVR or Crosspack or avrdude
http://www.ladyada.net/learn/avr/avrdude.html
Crosspack: MacOS http://www.obdev.at/products/crosspack/index.html
AVR Studio: Windows http://www.atmel.com/tools/avrstudio4.aspx
a programmer, or you can use your Arduino Uno too...
http://hlt.media.mit.edu/?p=1695
I used my avrispkkII
http://www.atmel.com/tools/AVRISPMKII.aspx

General
A nice desk to work on, some good light, magnifying glass
glue

Time
depending on your demands 1 afternoon to a few days (depending on your detailing abilities)