Using these recipes: http://thetekkit.wikia.com/wiki/Ender_Chest
In the first we tried coloured wool so it would be dyed on creation, came out uncoloured. Tried creating one uncoloured and dying it using the second image, it also came out uncoloured.
here's the forum section on the crops
http://forum.industrial-craft.net/index.php?page=Board&boardID=64
this seems quite usefull
http://forum.industrial-craft.net/index.php?page=Thread&threadID=4004
looks like we can breed plants to drop dyes, including ink sacks or coca beans and sticky resin among other effects.