Cause I haven't seen someone adapting and publishing a theme for the modpack I thought I'll be the first. I've decided for one of Gizmos themes, Connections (original theme: http://forum.coppermine-gallery.net/index.php?topic=34783.0 ).
How to make a theme modpack compatible is described here:
http://forum.coppermine-gallery.net/index.php?topic=34905.msg163858#msg163858