Change WP Template to different one

I have an existing wordpress website but we want to change the template from what it looks like now, (see attached) to one with a big photo header as the background. I will supply the photo. This is about 2 to 3 hours work when I do this, but I don't have time to get it done by Friday of this week. I install and customize wordpress everyday, but I'm slammed right now. I need a WP person to either change up this template to support a large background image in the header OR install a different template. This isn't a lot of work so don't go bid crazy. This is a SIMPLE project for any WordPress person!!! This will be escrow through gaf and you can make it 2 milestones if you want...