Assalam alykum, thanks for bumping the thread, it seems a bit underated
my favourite is the 4th one to the right that says "servant of Allah"
Jakaz allah khair, i have a temptatopn use that at this non-muslims forum just to get everyone angry, but i wont, i will probably use it for my gmail account though
one suggestion though, i think the phrase "smile its a sunnah" would work well