I made 4 identical latestimages_block.php and numbered them latestimages1_block.php etc...[i altered the colors of eack one]then from index.php i called each one for each theme i use at my site! PROBLEM SOLVED!
I use my brain, even my coding skill are very limited ! !
example:
at index.php
Code:
if($theme == 'xxxxxxxxxxxxxx')include("blocks/latestimagesX_block.php");