I have a small preview of what'll probably end up being a pretty big set. (Since I just have now finished getting all my source pics together, which is by far the longest part of the process.)
I love simmerized decor. Posters, magazines, anything. I'm just now getting to the point where I'm decorating my sims' houses with pictures of THEM instead of other sims. I thought to myself, what's lacking is some musicians. I came up with seven musical acts (I've got two bands, and some "stereotypical" solo artists), and I made some album covers (at least two apiece), took other shots for promo pics/posters, and I'm going to do at least one magazine cover for each.
Actually applying the pictures to textures for objects is the easy part. I've started by doing the CD clutter from Around the Sims 2:
I plan on doing posters of all the album covers, posters of individual band members, etc. So enough things to decorate the room if your sim decides they're a real big fan of, say "Deathmask," my metal/goth band.
Oh, what the heck, here's a fullsize Deathmask CD cover: "Burning Soul Death--Live!" (I am so easily amused.)