Whats a good Halloween costume for.....?

What is a creative and cute Halloween costume for 2 year old twins? I have a boy and a girl and I want it to be something that matches, yet is different. Last year they were and Angel & Devil... this year I was thinking a Sal & Pepper shaker (lol) or Pebbles and BamBam... I dont know... do you have any good ideas for me?