A fax coversheet shortcut that you might want to use is to reuse the one from the original fax to you. I suggest you use it to shorten the time it takes to turn a fax around. I know, some of us like a beautiful fax cover sheet that we create using our word processor standard templates. Yes, they're nice and they're seldom worth the time they take to create. The short cut is to simply strike through the TO: in front of your name and write FROM in its place. Then, strike the FROM: in front of the sender's name and write TO: in its place. Thus all the information, which hasn't changed, is already on the paper.
The sample below shows how simply this is achieved. Click on the image to enlarge it. This reuse is about effective action (and saving resources)– it gets the job done and does not reflect poorly on anyone who uses it. Give it a try on your next fax exchange.
In recognizing John's alternative... and as he says - they're usually not handy when you need them... but if they are... this is another quick and effective alternative.