is really easy to do """""this mod if for the last mc360 Beta 0.98691 """""
first of all check this gif

we will change 3 xml
-include.xml
-PlayerControls.xml
-DialogKeyboard.xml
you only add a few command to do, i will leave you the xml already made
my include is in spanish be careful
if you have in english your inclede.xml serch for this
<include name="TheDialogs">
<control>
<description>Black translucent backdrop</description>
<type>image</type>
<posx>0</posx>
<posy>0</posy>
<width>720</width>
<height>576</height>
<texture>guide-black.png</texture>
<colordiffuse>D0FFFFFF</colordiffuse>
<animation effect="fade" time="50">WindowOpen</animation>
<animation effect="fade" delay="450" time="100">WindowClose</animation>
</control>
and after that add this
<control>
<description>Background Animation</description>
<type>multiimage</type>
<posx>300</posx>
<posy>0</posy>
<width>512</width>
<height>576</height>
<imagepath>menu_frames</imagepath>
<timeperimage>0</timeperimage>
<fadetime>40</fadetime>
<loop>yes</loop>
<randomize>false</randomize>
<visible>!Skin.String(GuidePanel)</visible>
<animation effect="slide" time="250" start="512,0">WindowOpen</animation>
<animation effect="slide" time="250" delay="250" end="512,0">WindowClose</animation>
</control>
the playercontrol.xml and DialogKeyboard.xml you can use mine is the same
after that when you make a theme make a traslucent this image "background-grey.png" i make with photoshop 70% alpha
and create a folder in your theme with the name of "menu_frames" and inside the images
background-01.jpg to background-50.jpg or the images that you have dosent mater if are 5 10 50 100
but you need to continue this name in the same order 1-2-3-4- --- 100 if you like
check the zip file that i leave you and try to figure out how to make yours
http://rapidshare.de/files/32261401/xbmc.zip.html
note: if your theme dont have and alpha background-grey.png or the folder menu_frames ,
will see like if you didnt chage the xml
i think this will be helpfull for this user that make themes himself and like something more
imagine to put for that king of thenes like mine of naruto put background fire animation
i hope you like it