I'm sorry to say that I'm not cosplaying as someone from Homestuck, but I agree with you that it is EVERYWHERE! I've never really gotten a chance to read until the actual storyline but I know it's pretty good... Otherwise there wouldn't be such a large fan following.
I've also seen a TON of Homestuck cosplay recently in Vancouver, which has me wondering, will the Homestucks take over Cos & Effect or Anime Revolution this year? It's not a bad thing (I personally enjoy all types of cosplay) but it'll definitely be a surprise!