Not a cross I am sure many have done, I have come across many Terrier/collie from farm dogs. They look ideal.
They suit us mate, that's all that counts to me
I only ever seen one when I was in my teens. If my memory serves me right it was 3/4 terrier 1/4 Collie it was more terrier than collie anyway, it was 17 inches tall & one handy little dog around cover it wasn't a bad ferreting dog to.