Is this hard to implement? I think rounded corner edges will make etouch look more modern
You could do it by modifying the cover image I guess but that will still be a square image so the background will not show through the curved corners. This wouldn't be a problem if the background is black and you made the background of the covers black. Or another way would be use the album cover frames as they are transparent but you will have that frame image over the top of the cover.
No worries it doesn't look that bad. I'm just finishing a new skin it is almost an amazon music clone. It seems transparent pages and blurred background images matching the album covers is what they use to make it pop.