I wonder if a HUD could provide a tilt-shift effect?

maybe alpha transparent a blurry border and stretch it to the size of your screen?

You could do something similar with having alpha + glow effect on the hud, but they removed glowing huds

I had played with that effect a little with this UA screenshot: farm4.static.flickr.com/...

we thought of the HUD - need to wait for them to reintroduce glow to it