I really like the Quorn breaded chicken burgers, I prefer them to real chicken burgers. I like the sausages ok too but they taste nothing like real sausages.
Another thing you could use is Yam Cake, I think it's called Konnyaku, it's sold at some Oriental food stockists, particularly Japanese ones. It doesn't taste of anything but it absorbs the flavours of what it's cooked in. I don't like tofu so I use it instead.