I tried those on in store, and they make major "toe cleavage." I love the idea though; it's the third rainy day here in DC and I'm sick of my rain boots!
I tried on a similar pair at Nordstroms a while back, and while they were super cute, they just didn't seem too practical - wouldn't the little bow sag? I hear you on the rain thing though... I've been switching out my wellies and bean boots for a little variety