You could also do an advanced search on the AHS site. I just did one for bloom size between 10-15" and scape height 30-60" and got 409 daylilies! Unfortunately, I didn't see an option to choose a color. And of course, there are probably a lot of those that can't be found to purchase, but it really opens up your search options and many have pictures.
http://www.daylilydatabase.org...
Looked at pictures of the hydrangea "Vanilla Strawberry" and WOW! That's a beauty of a shrub! You live in a great zone for daylilies
Just throwing this one out there. Ruby Spider probably won't go with the colors in your hydrangea, but it does have a large bloom.
I just purchased Give Me Eight (a white poly) so I don't know how it performs, but it is an 8" bloom on a 48" scape. There are several good pictures in the database. Mine hasn't had a good bloom since I just got it.
Daylily (Hemerocallis 'Give Me Eight')
Happy hunting!
