One interesting thing is that the current Watchtower logo shows a castle archecture not used in Biblical times. IMO the current "Watchtower" is more Norman than anything else. I'll let an expert take that over.
Current "Study" Watchtowers amplified the logo by printing the tower on every cover. Compare, its an obvious nod to the original Watchtower cover (the old watchtower looks more like a light house).
The closest connection to 'pagan' I can find is the tarot for Tower Card, strikingly like the original Watchtower:
Note the clouds, lightening, the cliff edge and crown shaped roof. The style of this tarot image would have been common at the time of the original Watchtower.
Card meaning Source: http://www.tarotexperts.com/cards/thetower.html
It is the card number 16 and is ruled by the planet mars. The positive aspects associated with this card are disguised blessing and a change which is necessary. On the other hand the negative aspects associated with this card are any kind of disaster, downfall and disruptions. It is a very hard issue to associate with the positive aspect of this card as it mainly symbolizes matters which are to be felt afraid or feared off. It reflects unreasonable suffering and a person with this card in appearance can get accused without being guilty.