Who said weddings have to be just white, or all white? Many weddings have a colour theme and you might like ot reference that colour theme or give your hair a drastic make over with brightly coloured hair extensions. They are an idea way to make your goth tiara or cheap tiara look even more amazing.
Stay with me, because hair extensions don't have to mean hours in the salon, hark back to Paris Hilton or break the bank.
Check out Ebay for micro loop hair extentions, which can be applied by your mum/sister/friend - again there are plenty of videos on Youtube explaining how to.
Micro loop extentions don't needs glue and are clamped in place with flat nose pliers (available from DIY stores for £3, don't pay upto £15 from hair extension places for the exactly the same thing). They don't damage your hair, are much easier to maintain and take out than glue in ones (ouch!).
You needs 100- 200 strands for a full head, so can easily get enough hair from Ebay for under £40. It takes 2-3 hours to do a full head. Done professionally, this can easily cost over £300.
Wash your hair with gentle baby shampoo, every few days, use dry shampoo inbetween if you need to. Be gentle with your roots, but your extensions can be dried, curled or straightened just like your normal hair.