What can you buy for $5 (Rs. 250)?

Another day of tinkering with Arduino + LEDs, yielded the 9x9 grid and the entailing challenges.
The problem is to address any one of the nine units uniquely. As the rows and columns are connected, it is not possible to do so by a simple (x,y) address. To accomplish this task, we use what is known as POV (persistence of vision).
Each column (or row) is given a high voltage in a loop. While a particular column (or row) is active, the corresponding row (or column) can be addressed so as to light up the one or many desired LEDs in the current row (or column).
The code I wrote for Arduino is too messy to be shared but I am working on it. Here are two of the patterns I achieved.

A happy new year to all!
Whats a better way to start the year than playing with the Arduino board!
Thanks to Aparna and Maitreyee, I visited the electronic hobbyists' market in Chandni Chowk to buy some basic stuff (LEDs, breadboard, wires, soldering iron etc).
I started off with basic computer-board communication exercises. This is one of the things I tried – A 6 series LED chaser.