ok im the first to admit.. i dont know wtf the obsidian theme looks like.. lol.. this was mostly done by a friend of mine (mekwall - http://writeless.se/2011/01/phpstorm-obisidian-theme/ ) and i did a few tweaks to get it "just right" for myself.. so he deserves the credit.
the usual windows
Full window view
yes... i know the code sucks lol..
get it on github https://github.com/SugaSlide/PHPStorm-settings/tree/master/colors copy it to (on windows.. not sure bout the others)
restart phpstorm if its open.. go to settings > Editor > Colors & fonts > select "obsidian_modified" from the scheme drop down.. should work. enjoy.
took me some getting used to.. but i rather like these colours with the nimbus "look and feel"