I made one just for you :Dhttp://jaketripplj.deviantart.com/art/Advancing-Tar-172689800Click download
http://www.google.com/images?q=circuit+board&um=1&hl=en&biw=1600&bih=807&tbs=isch:1,ic:specific,isc:blue,isz:l&source=lnt&sa=X&ei=WqVMTISDIY30swP_5cmNCw&ved=0CAsQpwU
So you add a watermark.