I see avatars, signatures or images on the forums with flashing patterns that may trigger seizures in people with photosensitive epilepsy. I'm not sure how much people are on the forums who may have photosensitive epilepsy and I'm not sure how much this would help for them, but my suggestion is that there should be an official note at the forum rules where people are suggested not to use any avatars or signatures with flashing lights or patterns anymore, and if they do use images who may trigger an seizure in their posts, then they should put in a spoiler with a note above saying that the following image may trigger people with photosensitive epilepsy. I think the forums should be a safe place for everyone. Also, I have heard that images which have a lot of flashing lights may cause migraine attacks too.
Photosensitive epilepsy is a form of epilepsy in which seizures are triggered by visual stimuli that form patterns in time or space, such as flashing lights, bold, regular patterns, or regular moving patterns.