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this looks lovely and makes their jobs a little more rewarding. I like the textures, shadows, and cutout photos. i think you already are planning to create more buttons and repeat the same ones less in that big random buttoned area.
you could let them customize messages to, instead of only choosing a color they could also pick the message :)
might be nice to create a reverse for dr's to send to patients ~ "get well soon" or "thanks for trusting us" or "congratulations"-if a new baby ...as sortof a lollipop for adult patients.

We are playing with the idea of having the medical staff send their replies to the posts. We're now seeing if the budget allows such a reverse feature.
For the button messages, any ideas on how a user may customize the text? Limited characters like Twitter posts? Our main concern is that each button has only a limited space and laying out custom text on them might be a challenge.