Designer Banlu Kemiyatorn has a lot of great designs in his Shop. My personal favorites are his Bracelets. Each of them is a co-creator and you can customize the inner diameter of the bracelet. Bracelet Number 6 looks very modern to me.  I also love Bracelet Number 9 and the mega spiky Bracelet Number 3.  They're high tech without being cold, if that makes sense.