Hi Joel,
I think this has been mentioned before, but the monitor icons (32-bit and 8-bit for size 32) show a wider lower half of the monitor compared to the upper half (I think the 32-bit size 22 as well).
I've heard feedback about the screen colour before, which I've resolved. Never any queries about the shape of the screen. The reason it's slightly wider at the top to the bottom is that it is drawn in perspective, which is how the screen is drawn in the Tango base set. I believe only The 48px-32bit and 48px-8bit have this.