I picked a higher resolution pack and Minecraft crashed! I can't log in to change my pack! What do I do?

— Minecraft Crash Report ----
// Ouch. That hurt

Time: 8/1/13 6:16 PM
Description: Registering texture

bhy
at bhv.c(SourceFile:58)
at bhz.b(SourceFile:92)
at bhz.a(SourceFile:59)
at bib.a(SourceFile:69)
at bib.a(SourceFile:58)
at bib.a(SourceFile:49)
at atn.O(SourceFile:377)
at atn.d(SourceFile:598)
at net.minecraft.client.main.Main.main(SourceFile:101)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bhv.c(SourceFile:58)
at bhz.b(SourceFile:92)
at bhz.a(SourceFile:59)

– Resource location being registered –
Details:
Resource location: minecraft:textures/atlas/blocks.png
Texture object class: bhz
Stacktrace:
at bib.a(SourceFile:69)
at bib.a(SourceFile:58)
at bib.a(SourceFile:49)
at atn.O(SourceFile:377)

– Initialization –
Details:
Stacktrace:
at atn.d(SourceFile:598)
at net.minecraft.client.main.Main.main(SourceFile:101)

– System Details –
Details:
Minecraft Version: 1.6.1
Operating System: Mac OS X (x86_64) version 10.8.4
Java Version: 1.6.0_51, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 320630392 bytes (305 MB) / 1069416448 bytes (1019 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.6.1
LWJGL: 2.9.0
OpenGL: NVIDIA GeForce 320M OpenGL Engine GL version 2.1 NVIDIA-8.12.47 310.40.00.05f01, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: untitled folder
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~_ERROR~ NullPointerException: null