The San Jose Quilt Museum in California may be interested.
http://www.sjquiltmuseum.org/

I don't know where the museums are, but wanted to say how sorry I am for your loss. Your husbands quilts are amazing and obviously gave him a lot of pleasure to create.

I also am not familiar with any museums either. Sorry for the lost of your husband. He was so talented.

There is an Internet group. I believe it is Quilt History List. They appear to know lot about quilt museums.

Try the Texas Quilt Museum http://www.texasquiltmuseum.org/

Your DH's quilts are works of art. Sorry for your loss.