If you have a decent web site, you put in time every so often to keep it updated. These often brightly colored signs are another distraction to the eye and are totally unnecessary, in my opinion. Some of them are downright amusing. I would, however, recommend using no more than one per page. They distract the eye, also, and if they're not done properly or are too big in file size, they can take a long time to load.
Music is another problem.
I like the sites where I can control the volume and even shut off the music if I so choose. I hate the sites where I'm forced to listen to music the whole time I'm in there. Music also increases your page loading time considerably, which is something else you should give strong consideration to. Wallpaper is kind of a ticklish situation. Most of the wallpaper and textured backgrounds on the Web are very badly done.