Try coffee cup
http://www.coffeecup.com/
You get a free trial so if you prefer this instead of a site builder you can upgrade it, also if you want something a little more advanced I recommended its also as a free trial its just a lot more expensive to upgrade.
Dreamweaver CS3
http://www.adobe.com/products/dreamweaver/
Then you will be able to add your own codes or colour with a design preview and then be able to upload everything manually via FTP.
The code for background:
<body bgcolor="#ooooff"> or <body bgcolor="blue">
These are both blue codes, however the second will only work if you have it defined in a CSS document.