Fred & Rose West
Big daddy and little sister.
Noose around neck and a hangman outfit.
Slutty nurse with a doctor outfit for the woman.
Nametags with dennis and regina on them.
Might be arranged in descending cost
ok...but if you're doing it on a budget of £4.50 it IS going to look like Blue Peter went shopping at the pound store...
is it a particularly special occasion party? (if so, spend a bit, add props, sound FX, lights, make-up etc...) or just a run of the mill everyone get pissed house party? (If so, the cheapo option is best as no one will care what you're wearing...)
Undead Michael Jackson & Amy Winehouse
That would actually be bad ass but the big daddy would be hard to pull off and you would need a short girl.