So I've noticed that some people have a background of blue splashes on their forum posts.

Why?

it was the beginning of the omen island event where there was a water fight : users hit with balloons/squirt guns have a splashy post :) It will most likely go away when the event is over ^__^

Oh I see xD

Thanks for explaining!

its what was left from last night

ok not rly, we had a water/soaking event. :)