Modification oF Joomla 1.5 template

Hi I'm looking for a designer with joomla experience to modify a template that i've installed in [login to view URL] (joomla 1.5); this template as you can see is really white and with a lot of blank spaces, it needs a fix in a few aspects, something similar to what I attach here; probably not totally green and dark, but half way between the two... thanks Roberto