Creating dry ice or fog in After Effects

The Clash Black and white grainy London calling cover was before the Unkle album cover and this gave me an idea.  An effect which i would like to achieve was to get the Futura characters to appear through some dry ice or fog. 


I found this tutorial on line which did not use plug ins and basically followed it - it was actually relatively simple but really effective.

Some screen shots of how I did this are below.

When I added the Fog composition to the Unkle one I scaled the Fog one up and masked and feathered the edges so the Fog would not appear 'oblong shaped.