I am a real sketch fan, how about you? I love Becky Fleck sketches (http://www.pagemaps.com/), and when I get new mags I will often sketch layouts that I like, but I also love to sketch ideas from in my head before I create a page. The thing I really like about sketches as opposed to looking at actual layouts is, I find sometimes the paper that was used, or the photos used can put you off. Where as a sketch has no colours, patterns or distracting photos. Another great thing about sketches is that everyone interprets them differently.
Another great site to find sketches is Pencil Lines http://www.pencillines.com/ this site has about 8 sketch designers on their team from around the world and also guest designers so there is always something to suit most tastes.