i was struggling to find any themes for the z8 so i have made this one using the sony erricson theme creator but you must choose a a uiq phone when selecting the device template something like the m960i
To use and the not all the settings are there for the z8 so i did the best i could please tell me what you thing

Can U give us the name of the application ?
Maybe I will try to do something to.

And can u tell me how to install theme on phone ?

Thx in advance.

developer.sonyericsson.com/site/global/home/p_home.jsp
thats the site i i got it from the name is sony erricson themes creator believe oh not i think that they just like to keep thinks pretty simple

does what is say on tin

try themes from here
http://www.uiq.com/uiq_themes.html