A Lurcher X Collie, is a "lurcher"! A lurcher isn't actually a breed, a lurcher is a cross between a working dog and a hound, The worker, very often a Collie and a hound, very often a greyhound, The worker gives the dog intelligence and the hound for the speed, lurchers are generally bred for catching rabbits or fox in this country but have hunted all manner of beast all over the world.
A whippet X Terrier is also a common X for a smaller lurcher, more useful on rabbits hunting in smaller fields, can turn and out pace the bunny so much faster, the bigger lurchers are better for fox and bigger fields. Greyhound crosses are usually great pets, very docile and loving when at home, just beware with lurchers, they will usually chase anything that moves :) I have hunted with Lurchers for years, great dogs :)