i agree about their changing their favourites often... however, my son was a CARS fanatic for about 3 years and has LOVED Ben 10 for at least the past 3... so really, it's not a big deal. besides, i like to repaint their rooms every couple of years, if we've only used stickers, then they are easily and cheaply replaced.
i LOVE the craft idea, but as you know, thanka, i do hundreds of crafts with my kids every year.... no way i can keep them! LOL!