sorry i couldn't find the crash reports file name or where it was stored... But i was able to copy it so here it is. I was messing around with command blocks summoning fire works, i tried to make the fire work color ID 0 and then spawn it.... and that's when it crashes XD.

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 1/29/14 11:06 AM
Description: Reading NBT data

java.lang.ClassCastException: dp cannot be cast to dm
at dg.l(SourceFile:202)
at bky.h(SourceFile:86)
at blh.a(SourceFile:64)
at azi.p(SourceFile:1562)
at azi.ah(SourceFile:760)
at azi.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:152)

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

– Head –
Stacktrace:
at dg.l(SourceFile:202)

– Corrupt NBT tag –
Details:
Tag type found: LIST
Tag type expected: INT[]
Tag name: Colors
Stacktrace:
at dg.l(SourceFile:202)
at bky.h(SourceFile:86)

– Particle being ticked –
Details:
Particle: bky, Pos (143.5,5.08,-363.5), RGBA (1.0,1.0,1.0,1.0), Age 0
Particle Type: MISC_TEXTURE
Stacktrace:
at blh.a(SourceFile:64)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bkf['Eagle_of_light'/1206484, l='MpServer', x=143.64, y=5.62, z=-366.08]]
Chunk stats: MultiplayerChunkCache: 624, 624
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (136,4,-367), Chunk: (at 8,0,1 in 8,-23; contains blocks 128,0,-368 to 143,255,-353), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 91046 game time, 7301 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 30 total; [uy['Cow'/1206444, l='MpServer', x=103.81, y=4.00, z=-391.25], vf['Pig'/1206445, l='MpServer', x=101.72, y=4.00, z=-367.88], uy['Cow'/1206446, l='MpServer', x=96.09, y=4.00, z=-317.94], xw['entity.FireworksRocketEntity.name'/1807357, l='MpServer', x=143.50, y=5.20, z=-363.50], uy['Cow'/1206442, l='MpServer', x=100.31, y=4.00, z=-441.28], uy['Cow'/1206437, l='MpServer', x=89.31, y=4.00, z=-416.28], uy['Cow'/1206438, l='MpServer', x=95.94, y=4.00, z=-353.03], uy['Cow'/1206432, l='MpServer', x=72.25, y=4.00, z=-431.19], uz['Horse'/1206433, l='MpServer', x=73.50, y=4.00, z=-372.19], vf['Pig'/1206434, l='MpServer', x=81.84, y=4.00, z=-355.19], uy['Cow'/1206461, l='MpServer', x=165.03, y=4.00, z=-336.06], vg['Sheep'/1206460, l='MpServer', x=155.03, y=4.00, z=-368.94], vg['Sheep'/1206463, l='MpServer', x=205.97, y=4.00, z=-356.94], vg['Sheep'/1206462, l='MpServer', x=164.31, y=4.00, z=-328.22], vg['Sheep'/1206457, l='MpServer', x=157.88, y=4.00, z=-305.06], vf['Pig'/1206456, l='MpServer', x=156.84, y=4.00, z=-320.41], vf['Pig'/1206459, l='MpServer', x=150.78, y=4.00, z=-293.31], vf['Pig'/1206458, l='MpServer', x=144.91, y=4.00, z=-290.41], uy['Cow'/1206452, l='MpServer', x=114.75, y=4.00, z=-406.72], vf['Pig'/1206455, l='MpServer', x=138.03, y=4.00, z=-302.03], vg['Sheep'/1206454, l='MpServer', x=142.03, y=4.00, z=-318.25], vg['Sheep'/1206464, l='MpServer', x=204.19, y=4.00, z=-348.91], vg['Sheep'/1206465, l='MpServer', x=207.22, y=4.00, z=-346.34], vg['Sheep'/1206470, l='MpServer', x=211.16, y=4.00, z=-358.19], uz['Horse'/1206471, l='MpServer', x=221.22, y=4.00, z=-291.41], vg['Sheep'/1206469, l='MpServer', x=216.09, y=4.00, z=-364.25], uy['Cow'/1206431, l='MpServer', x=69.03, y=4.00, z=-428.88], bkf['Eagle_of_light'/1206484, l='MpServer', x=143.64, y=5.62, z=-366.08], uy['Cow'/1206430, l='MpServer', x=75.03, y=4.00, z=-425.06], uy['Cow'/1206428, l='MpServer', x=66.88, y=4.00, z=-436.84]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bka.a(SourceFile:289)
at azi.b(SourceFile:1952)
at azi.f(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:152)

– System Details –
Details:
Minecraft Version: 1.7.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 209525272 bytes (199 MB) / 358612992 bytes (342 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 5091 (285096 bytes; 0 MB) allocated, 543 (30408 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.7.4
LWJGL: 2.9.1
OpenGL: Intel Bear Lake B GL version 1.4.0 - Build 8.14.10.1930, Intel
GL Caps: Using GL 1.3 multitexturing.
Not using framebuffer objects because OpenGL 1.4 is supported, EXT_blend_func_separate is supported, OpenGL 3.0 is not supported, ARB_framebuffer_object is not supported, and EXT_framebuffer_object is not supported.
Anisotropic filtering is supported and maximum anisotropy is 4.
Shaders are not available because OpenGL 2.1 is not supported, ARB_shader_objects is not supported, ARB_vertex_shader is not supported, and ARB_fragment_shader is not supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 284 (15904 bytes; 0 MB) allocated, 78 (4368 bytes; 0 MB) used
Anisotropic Filtering: Off (1)