Help setting textures for sub-blocks (damage value)

Greetings,

I've been trying to convert a Minecraft 1.5.2 mod I've written to use one ID for 6 different colored blocks instead of 6 different blocks but they all have the same texture.

I followed the guide on the wiki to get the 6 blocks registered under the same ID but I can't seem to figure out how to give them different textures.

So far I have 6 separate blocks that register properly (creative tab and crafting) and 6 separate texture files. I just can't figure out how to register the different textures. In the creative tab, inventory and when placed they all have the same texture.

Any tips would be appreciated, thanks!

Notes:

• The guide on the wiki is a little outdated. In 1.5.2 there is no getBlockTextureFromSideAndMetadata() and other related functions to override.
  
• I want to stay with 1.5.2 for now