To use a different shade of green, you'd have to open the files in an image editor, and adjust the color, or ask me really really nice, LOL, to make some changes for you. Though I'm a little short for time at the moment, may take a while.
The error that is there really isn't an important one, it can be ignored. But if you really want it gone, open up includes/functions/extra_functions/search_field_header.php and change where it says:
$type = 'search'
to:
$type = 'text'
Now, people with Safari won't see the rounded search box at the top, but everyone else will still have the same rounded box.
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