you can also use artists acrylic paint to color the epoxy. One other thing I have been doing in large cracks, fix large rough patches and finish the inside of hard to finish punky pieces is use the make it (insert name) textured paint and spraypaint. One of my favorites of late has been the tintable make it leather. I have been using it to cover the inside of punky spalted maple hollow forms and rough patches on the outside which would have caused me just to chuck the piece in the burn barrel before. Bleached spalted maple and box elder looks really cool with red leather inlay.
Another metal inlay you can use is lead or pewter. Just melt in an open air area (not only is it bad for you it also smells bad), I use the propane burner for my turkey frier and an old cast iron kettle. When all melted pour the melted metal into the cracks of the unturned or rough turned pieces let it cool overnight atleast. though I have never melted lead on its own to do this only pre bought pewter, I have turned several pieces from trees near a firing range and a polished piece of lead always is an interesting look in a turning. The dangers of lead should be self evident to all of us with any brains and I shouldn't have to mention it, but I am doing so simply to save us a long post by an annoying rodent with nothing better to do than detailing the dangers of lead and bitching about the fact I didn't start the post with a big warning label saying in the subject line and at the beging of the post saying "WARNING LEAD IS DANGEROUS!" and this post may real, dead, unboned, uncooked frogs, artificial flavors & colorings, monosodium glutamate and larks vomit!