This is what we were going to do for our upcoming wedding....my FI and I are doing the sand ceremony, but i wanted to do something for our moms as well, a blending of the two families. The only thing i have to figure out is when to do this as far as timing goes, but here it is anyways...
FI and I will do the sand ceremony using our two main colours baby blue for him, and black for me we will do this before we exchange our rings....then at some point we will do a unity painting for our moms and us, each person doing a circle moms on either side of the canvas FI will do one by my moms, and I will do one by FI mom. (IF YOU CAN PICTURE IT)
my mom will use a lime green pain colour
his mom will use a orange paint colour
FI again will do baby blue
and me again with the black
once we get back home... i will place the sand the painting and a picture of FI and I on our wedding day on a shelf for all to see. I really just need to figure out when to do the painting in regards to the actual ceremony!!