It appears if you use the "stock" Neutrino theme Talk is greyscale, but as soon as you apply a CM7 theme via theme chooser, you get color again.
but i like Neutrino theme!!
so clean and beauty!!
If having Talk in greyscale is the price to pay, i'll stay like there.. i'd rather having colours 'cause i heavily use Talk, so have coloured icons can easier show instantly who's online, who's busy and so on.. it's only a minor improvement, but not so important to change the whole theme..
I'm much more worried about the alarm thing..