Construction: Clusterf&*@. Alright, so I decided to not use the breadboard because the LEDs would be too close together and it's not really set up for grid structures. The way this works is that pins 3-7 will power the rows, and pins 8-12 will be connected to the columns. I got this idea from the instructable here http://www.instructables.com/id/Yet-Another-Daft-Punk-Coffee-TableDisplay/step3/Wire-it-up/ . If you go to the link, you can find the circuit diagram that I based my build on.
The most difficult part of my construction was that I was using solid core wire, so let's do some math... 5x5 grid=25 leds, 25 ledsx2 wires each=50 connections that I had to twist together by hand, and make sure they didn't touch any other connection and create a short circuit. How did I do it? Equal parts insanity and patience. My fingers really hurt right now, but I think it was worth it.
Coding: I basically took the coding from my 2x2 grid and extended it to work with 5x5.
Result:
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