I guess in years the rails default page has not changed much. and now when rails5 is to be launched, it would be sad if we could not redesign the default html page which you can access @ http://localhost:3000 #Given it should be a fresh rails application.
I could not resist and did my take on it. please have a look, positive criticism is highly appreciated.
IMHO if you have couple of hours,as a refresher; do your take on it. I am attaching the .sketch file, give it a try.
you can find current page Here
It gets generated from this path in rails source
L or F like