Just get a new haircut! Seriously, some people would kill for black hair- if you dye it it might never go back to its original colour. You can't guarantee that any other colour would suit you, and your mum would kill you anyway! Also, if you wanted a bright colour you would have to bleach your hair which would SERIOUSLY damage it.
If its long, cut it short- it can look REALLY nice. If its short start growing it out and see what happens.