Just thinking about it, we have hats that get added to those who achieve 1000 guild hours. So why can't we have Spar hats or PK hats? It makes sense, because I gild hat takes around 4-6 weeks for an average hat guild, yet every 100k PKs or every 10k spars take a lot longer to earn than 4-6 weeks. So it should be added, this would also make more people think seriously about PKing / Sparring more.