After switching resource pack, skin is purple/black and bears no relation to my own

Unable to confirm, can you upload your resourcepack used?

This is the resource pack.

And don't hurt on me for using Xray in my survival world.

Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.

Crash Report added.

Your Java version is out of date. Please update your Java to the latest version (1.7.0_25): http://www.java.com/en/download/. Keep in mind that when using a 32-bit browser on a 64-bit OS the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.
Please report if the issue persists with the latest Java version.

Reopened because of MC-22988

Cannot reproduce.
Switched several times back and forth but the skin stays the same.

Can you please attach the output of the development console, maybe there is written something.

Client> 2013-07-07 07:17:34 [CLIENT] [INFO] Setting user: yrsegal
Client> 2013-07-07 07:17:34 [CLIENT] [INFO] (Session ID is token:1964c3393c874c01b96c479e7ffebe0d:458391f563034649b416e4c0d18f837a)
Client> 2013-07-07 07:17:34 [CLIENT] [INFO] LWJGL Version: 2.9.0
Client> 2013-07-07 07:17:34 [CLIENT] [INFO] Reloading ResourceManager: Default
Client> 
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client> 
Client> 2013-07-07 07:17:35 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-07-07 07:17:35 [CLIENT] [SEVERE] @ Post startup
Client> 2013-07-07 07:17:35 [CLIENT] [SEVERE] 1281: Invalid value
Client> 2013-07-07 07:17:36 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-07-07 07:17:36 [CLIENT] [SEVERE] @ Pre render
Client> 2013-07-07 07:17:36 [CLIENT] [SEVERE] 1281: Invalid value
Client> 2013-07-07 07:17:40 [CLIENT] [INFO] Reloading ResourceManager: Default, SC64, F&M Finder 16
Client> 
Client> SoundSystem shutting down...
Client>     Author: Paul Lamb, www.paulscode.com
Client> 
Client> 
Client> Starting up SoundSystem...
Client> 2013-07-07 07:17:41 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-07-07 07:17:41 [CLIENT] [SEVERE] @ Post render
Client> 2013-07-07 07:17:41 [CLIENT] [SEVERE] 1281: Invalid value
Client> Initializing LWJGL OpenAL
Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client> 
Client> 2013-07-07 07:17:46 [SERVER] [INFO] Starting integrated minecraft server version 1.6.1
Client> 2013-07-07 07:17:46 [SERVER] [INFO] Generating keypair
Client> 2013-07-07 07:17:47 [SERVER] [INFO] Preparing start region for level 0
Client> 2013-07-07 07:17:48 [SERVER] [INFO] Preparing spawn area: 94%
Client> loading single player
Client> 2013-07-07 07:17:48 [SERVER] [INFO] yrsegal[/127.0.0.1:0] logged in with entity id 31 at (12.365204530165213, 4.0, -351.96622108355734)
Client> 2013-07-07 07:17:48 [SERVER] [INFO] §cyrsegal§r joined the game
Client> Setting up custom skins
Client> 2013-07-07 07:17:52 [SERVER] [INFO] Saving and pausing game...
Client> 2013-07-07 07:17:52 [SERVER] [INFO] Saving chunks for level 'Fun'/Overworld
Client> 2013-07-07 07:17:52 [SERVER] [INFO] Saving chunks for level 'Fun'/Nether
Client> 2013-07-07 07:17:52 [SERVER] [INFO] Saving chunks for level 'Fun'/The End
Client> 2013-07-07 07:17:54 [CLIENT] [INFO] Reloading ResourceManager: Default
Client> 
Client> SoundSystem shutting down...
Client>     Author: Paul Lamb, www.paulscode.com
Client> 
Client> 
Client> Starting up SoundSystem...
Client> 2013-07-07 07:17:55 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-07-07 07:17:55 [CLIENT] [SEVERE] @ Post render
Client> 2013-07-07 07:17:55 [CLIENT] [SEVERE] 1281: Invalid value
Client> Initializing LWJGL OpenAL
Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client> 
Client> 2013-07-07 07:17:58 [SERVER] [INFO] Saving and pausing game...
Client> 2013-07-07 07:17:58 [SERVER] [INFO] Saving chunks for level 'Fun'/Overworld
Client> 2013-07-07 07:17:58 [SERVER] [INFO] Saving chunks for level 'Fun'/Nether
Client> 2013-07-07 07:17:58 [SERVER] [INFO] Saving chunks for level 'Fun'/The End
Client> 2013-07-07 07:17:59 [SERVER] [INFO] Stopping server
Client> 2013-07-07 07:17:59 [SERVER] [INFO] Saving players
Client> 2013-07-07 07:17:59 [SERVER] [INFO] §cyrsegal§r left the game
Client> 2013-07-07 07:17:59 [SERVER] [INFO] Saving worlds
Client> 2013-07-07 07:17:59 [SERVER] [INFO] Saving chunks for level 'Fun'/Overworld
Client> 2013-07-07 07:17:59 [SERVER] [INFO] Saving chunks for level 'Fun'/Nether
Client> 2013-07-07 07:17:59 [SERVER] [INFO] Saving chunks for level 'Fun'/The End
Client> 2013-07-07 07:17:59 [CLIENT] [INFO] Stopping!
Client> 
Client> SoundSystem shutting down...
Client>     Author: Paul Lamb, www.paulscode.com
Client> 
Game ended with no troubles detected (exit code 0)
Deleting /Users/yoni/Library/Application Support/minecraft/versions/1.6.1/1.6.1-natives-1373195853467326000

There you go:

Client> 2013-07-07 07:17:35 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-07-07 07:17:35 [CLIENT] [SEVERE] @ Post startup
Client> 2013-07-07 07:17:35 [CLIENT] [SEVERE] 1281: Invalid value
Client> 2013-07-07 07:17:36 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-07-07 07:17:36 [CLIENT] [SEVERE] @ Pre render
Client> 2013-07-07 07:17:36 [CLIENT] [SEVERE] 1281: Invalid value

I'd say: Install non broken Intel graphics drivers

OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 INTEL-8.12.47, Intel Inc.

and update your Java:

Java Version: 1.6.0_45, Apple Inc.

but i know your answer:

I can't, Apple...

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.