Calling UI/Ux Suggestion

I actually want to pitch a suggestion for iPhones. I love the poster thing and I use it much as well. But I cant add poster to every contact on my long list. I am suggesting that there should be an option that would use the current wallpaper as default poster for every contact if there isn't one specified already. I am kinda addicted to see posters when I call someone, and for many contacts where poster isn't specified it feels a bit weird to see dull blurry screen. If this feature could be added in upcoming iOS releases then I would be much happier.