I used to cover the nose of my boards with a million of the same stickers of whatever shop I was supporting at the time. Lately, though, I haven't been putting stickers on my board, simply because a lot of the time after I'm done skating a board, I'll either give it to a friend or if it breaks / I end up breaking it, I'll sand the graphic and paint on the board. Getting stickers off once they've been slid over is almost impossible.
The last sticker job I did on a board, it was on a Real with the absolutely worst graphic I've skated in quite some time... the "go skateboarding 24/7" or whatever graphic. I had just happened to have skated a Mother prior to it, and threw on a million no more corporate blues stickers to cover the graphic, sanded off the little badge on the tail, and threw one of those circle stickers there instead.