Ah, well I want a point and shoot camera (already have a big nice one, just want something small to pop in the diaper bag for everyday), my house cleaned, a nice purse, a WW membership, a "me" day with time to get a haircut, pedicure, lunch with friends and some shopping...
Or a mother's necklace of some sort if you don't already have one (I have one from Stella and Dot, he has given me a "charm" with each of the kids initials, as well as each of their birthstones, and it all goes on a chain with a "mom" charm).
Or I have a monogrammed market tote basket thingie that I use all the time, it's been so useful!
If I was back to my fighting weight, I would want some new tennis clothes.
For my first Mother's Day, DH took DD to a paint yout own pottery place and put DD's handprints on a mug for me. I love it better than anything that could have been bought in a store - so DH knows that's the kind of thing to get me.
You could ask for really anything you want. Last year I went away for a spa weekend for Mother's Day!