Knotted Knotwork I

Those friendship bracelets were "in" when I was at school, and somehow it came back to haunt me recently. It's a nice way to kill time on the bus, or on family functions...
This is a bookmark, 14,8 cm (4-7/8 in) long without the braids, 1200 and then some double knots (I used fairly thin crochet yarn because I was afraid it'd get too wide otherwise). Pattern is mine (not that it's terribly original or anything).