We are a family of six going as Father Time, Mother Nature and the 4 Seasons.
But costumes will be kept simple. The kids are making t-shirts today that include decorative items to coincide with which season they are (i.e. dd who is Autumn is attaching fabric red and orange leaves to a yellow t-shirt and ds who is winter has a light blue tee and attaching white snowflakes... etc).
I have a blue/green flowing tank top and am adding some accessories (head wreath, vines wrapped around my arms)
and dh is wearing white and a big oversized clock (ala RUN DMC type). He may wear a wizard hat, cape and beard but not sure if that will be too much for him!