This seems to be controlled by
sp@grace% dpkg -L epiphany-browser-data|xargs grep ubuntu-artwork /usr/share/gconf/defaults/10_epiphany-browser-data:/apps/epiphany/general/homepage file:///usr/share/ubuntu-artwork/home/locales/index-%l.html
This seems to be controlled by
sp@grace% dpkg -L epiphany- browser- data|xargs grep ubuntu-artwork gconf/defaults/ 10_epiphany- browser- data:/apps/ epiphany/ general/ homepage file:// /usr/share/ ubuntu- artwork/ home/locales/ index-% l.html
/usr/share/