I really liked the scrolling wallpaper too! I've put a bit of effort into finding an app, launcher or other way of enabling it. I've tried quite a few, but the only one I can remember finding that has it was the (expensive) TSF Shell 3d launcher. I'm not the kind of guy that spends $17 on a launcher, but it looked cool so I thought I'd check it out for the 10min grace period Play allows.
I'll post back if I come across an easy way of getting this back, but my hope is that this, among a few other tweaks, will come with a good ROM.