awesome. It really would make an awesome ios app icon, someone should make an app just for this icon. I liked it so much, i ran down to go get my ipad to put this app on my home screen. great work! if you don't mind me asking what computer software did you use to make this?
If I may give some critique: I think there's something wrong with the perspective. It bugs me when I look at it. If you look at the lines leading into the background, then the mat's lines will eventually meet each other in one point, but the glass' lines won't - they're parallel. Of course, if the icon is seen on it's own, I don't think it matters - it's just that with this background it really jumps out at me.
That is a common issue for app icon previews. Since app icons are generally made with an isometric-style perspective, placing them in environments where there actually IS perspective and a vanishing point will slightly distort things. However, if the environment contains no perspective, it ends up looking worse.