Keep Calm and Monogram On

I love all the new ways people are changing the old saying "Keep Calm Carry On" but I have to say I like this version the best!  Where did that saying come from anyway? 

I looked it up and found from Wikipedia- Keep Calm and Carry On was a propaganda poster produced by the British government in 1939 during the beginning of the Second World War, intended to raise the morale of the British public in the event of invasion. Seeing only limited distribution, it was little known. The poster was rediscovered in 2000 and has been re-issued by a number of private sector companies, and used as the decorative theme for a range of other products.

Now I'm not sure who came up with "Keep Calm and Monogram On" but I'd like to thank them!