I'd hope someone with photosensitive epilepsy would be smart enough to not click a thread titled "Seizure-inducing..."
NOPE TOO LATE.
But in all seriousness, I wouldn't use one of these as an avatar just in case one person on the forums does have epilepsy. Even though they wouldn't click on this thread, I'm sure they don't want to see seizure inducing avatars everywhere.
I don't have epilepsy, but if I look at strobe lights, or colors flashing for too long I start to get dizzy and a headache, I don't know if looking at them any longer would cause anything because I've never tried risking it and I don't plan on risking it.