I always love gift cards. My best idea would be a gift card(s) wrapped up with a fabric with hearts on it.

This would be my preference as well, a great idea! Gift Card, candles...

How about a bendable light? They are wonderful. A supreme slider (for free motion quilting) some thread, some batting, fabric, 6 yds of backing fabric & a her favorite CD!

I just thought of something I would like so maybe your wife would too. I little vacuum to clean her machine. I don't know if they make such a thing for machines, but they do for computers so I bet it would work on a machine.

I am assuming by this time she has an ott light. I have a floor model, I told my DH I needed a table ott light for my embroidery machine.

After reading this posting I am now able to give a list to my husband for MY Christmas gifts! LOL I even printed out the instuctions for the Big ironing board and left it on top of his desk. Maybe he will get the hint?
As for what to get your wife as a gift what about a coupon book you make up yourself for time? For example: 6 hours of uninterrupted quilt time, 2 hours of my time to clean the kitchen, an evening out- just the two of us, 2 hours of helping you pick out colors/fabrics. There are a hundred that run through my brain. Time is the one thing that is so hard to find and give. I love the time I get to spend with my hubby who is a very busy man.

Gift Certificate to her favorite quilting store.

Sounds like she has a longarm machine - how about a new attachment for it, or a new pattern?

Wally, when I read your post I couldn't stop laughing! You're a funny guy but also a VERY sweet and considerate one :)
Merry Christmas to you and yours!!
PS. I have nothing to add- lots of great ideas here!

Hope we will hear what you actually did for her!