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Scopula limboundata
Small, white moth
Lovely find, naturelover!
The Brown-bordered Geometer (Eumacaria madopata) does have some similarities but I think the Large Lace-border is a closer match. You were certainly on the right track Ingrid!
Here is the page for the Brown-bordered Geometer for comparison:
http://bugguide.net/node/view/38894
Its definitely a geometer moth of some kind. The species I suggested is close but may not be the right one.
I use BOOKS more than the web. The field would not let me add a book!
Peterson Field Guide NE N American Moths
Its probably on Bugguide.net