[udangaribaldi]

how to create internal skin 'themes' - sort of
<texture border="40">$VAR[DialogPath]DialogBack.png</texture>

it is the $VAR[DialogPath] prefix on the image png.  
so, add it to other image pngs, 
for example the recentaddedback.png.
copy recentaddedback.png from textures.xbt and paste it into the lf_classic folder.
create a new image for recentaddedback.png in the lf_modern folder also(and in lf_max if added the extra folders&images and/or if using max in the DialogPath)
copy all folders and images in the lf_modern folder and paste into the lf_max folder.(keep the original image) 
make sure all of the 3 lf_folders have same amount folders and same amount of images.(keeping same name but different images in each.)
find all instances of recentaddedback.png in the xmls and add the prefix so it would look something like this <texture border="15">$VAR[DialogPath]RecentAddedBack.png</texture>
so now when you change settings(dialog look and feel) the widget background image(recentaddedback.png) will change also.  
most of the home screen elements (widget, menubar, submenu, etc.) images can be changed using this method.  
p.s. - not all of the skin's images can be altered using this method - but a lot 
there are 3 lf folders in the textures.xbt and one has only one folder with one image in it 
goto strings.po find Dialog look and feel and change to LAF Themes or similar(not just themes)
you only need to sort about 5 or 6 more other images with the prefix and add and paste the current & new into the lf_folders to be able to 'theme' most of the homescreen
p.p.s. - in IncludesVariables.xml edit as so - 
<variable name="DialogPath">
        <value condition="String.IsEmpty(Skin.String(DialogLAF))">lf_modern/</value>
        <value condition="Skin.String(DialogLAF,Max)">lf_max/</value>
        <value>lf_classic/</value>
</variable>
now your able to use the 3 lf_folders -
so now you got 'classic' which his the default - 'modern' which is a little sharper than the 'classic' look - and a the 3rd 'max'

p.p... - more folders = more images = increase in size - so either stick to same size or try to better, even!
the ability for the end-user to add more folders and/or use own images is there - and it 'dead simple'  
  
add - soz i posted on the wrong site - but info given is good