Not for the main avatar*, no, but if I ever get to RP in some sort of FiM-or-FiM-related campaign (unlikely but who knows), I think I would go for some sort of corvid creature with a corresponding portrait (filling a supporting role, possibly reminiscent of Spike).
* == It took years before I fully embraced the spider assignment, reluctant to complicate people's ability to identify the user on sight after years of a stable previous avatar.