I've used foil before but never on the tube. I'll have to give it a try and see what happens with the insert and tail.
Another option would be pouring it open then injecting it. You could actually get a triple lam this way with the tail being the same color as the injection. This is just a theory as I have not tested it.
Another cool idea might be to dip the insert a dark color and then inject the bait. Should give a core shot effect.
There's just not enough hours in a day...
Jason