That will be fun. How big (or small) are you thinking?

The assortment of blues sounds gorgeous.

I'm doing one now that is a variety of blues from prints with navy background to ones with pale blue on cream. It alternates pinwheels with disappearing 4 patch. I'm really liking how it looks. Yours should work great!

I think it would be great in shades of blue.

I make pet pads for our vet to use in the cages...doesnt matter what fabrics I use...or how scrappy..its all to make our 4 legged babies more comfy...

If you can make a nice-looking 9 patch from the shades of blue it will look great as a disappearing variety.

If you do the d9p I would use the darkest blue for the centre square of the 9patch, a medium blue for the four centre side pieces and a light square for the four corners. I think they always look more striking with this configuration as the larger squares then appear to 'float' over the smaller squares and rectangles that emerge. If you're planning to use more than 3 fabrics, I'd sort them into three groups by colour value, ie dark, medium and light and place them as I suggested. I think it would be beautiful. :-D

Here are some to inpsire you! They are not all blue, but each is a variety of shades of one color.

http://www.quiltingboard.com/t-67422-1.htm

http://www.quiltingboard.com/t-118382-1.htm

http://www.quiltingboard.com/t-63128-1.htm

Sounds like it would be pretty

i didn't make a 9-patch in blues- but i did a whole bargello quilt with nothing but blues- it is wonderful- there are so many shades/colors of blues- as long as you have some contrast whole color quilts work very well-
i also did a quilt with nothing but tans/creams (star blocks) they are great too-
go for it- she will love it