You can finally use that beautiful large fireplace in your medieval castles without suffering a stupid-looking red chimney!  It's all very simple to do.  My tutorial, Zap The Red Chimney! shows you how (which a good thing really, because it wouldn't be much of a tutorial if it didn't).

You can either remove the chimney completely and replace it with your own built design or you can move it to another part of your building - it doesn't need to be joined to the fire).  And even if you make your own replacement chimney, you'll see that you can still keep the smoking part, as shown in the picture on the left.  And yes, you can even place the smoking part in different places too.  For a bemused Sim family, place it under the toilet after grandpa has just been (okay - I didn't just say that - can someone delete please?)

Works with all chimneys and the stove flu-pipe too!