Using an aerosol on your wrist to create a circular scar 
shoelaces in hair, all colours, sparkly ones etc.
Karma beads (circular beaded bracelet, came in all different colours)
Shag bands
Chains on trousers
Roller lipgloss
Dummy on a chain... At the under 18s disco, if you were cool, a LIGHT UP dummmy on a chain, and a whistle too.
Tiny tiny tiny strands coming out of the front of your hair when you had a ponytail.
Those braid things in bright colours (after you had been on holiday).
Year 2000 T-shirts, caps, etc (see how young I am 
Jelly sandals (primary school)
Godawful fake blonde highlights
Kappa stuff (if you were a TOWNIE, as they were called before chavs!)
Listening to tapes (Take THat, Spice Girls, Aqua) in class on a walkman held on your lap and threaded underneath your jumper