I remember two such things (non-jw) that were apparantly innocent, but actually caused a big stir in their day...
a) - Remember the Republican campaign TV ad that had the word "Democrats" as part of the text image - it panned down for a split second to just "rats"; it made the national news for a week or two. It was eventually revealed to just be an artifact of editing the TV ad for time. This, of course, did not prevent the Democrats from crying foul from the highest hill for all the silly publicity they could get.
As if this was actually going to change anybody's vote. Either way.
b) - Remember all the "Demonism" stink about the Proctor & Gamble logo? It had a quarter moon and maybe some starts or something - so some of the fundies freaked out and accused them of cavorting with Beelzebub naked in the forest, etc. As I recall, there were even some JW urban legends about this one.
As if this was going to change the way you buy floor cleaner. Either way.
Point being - in both cases, the "finders" of the nonsense subliminals tried to make themselves the beneficiary of the "find". Let's don't fall into this trap - it would make us ex-JWs just look silly in the long run.
But again I say - the dishonesty of the WTBTS would not prevent them from trying such a thing if it were really to their advantage. They do so with words, in essence.
However, how in the hell would putting a RamsHead or Skull into a picture in the WT help them in any way?
James
PS (unless you believe they are Machievellian enough to put it their hoping we would find it and make fools of ourselves...)