I'd like to share my past days work : emulator skins for more or less recent Android devices (Nexus 4, HTC One M8, Galaxy S4 Mini, Galaxy S5)
Get my AVD Skins on SourceForge
As for other/older skins, installation is simple : just copy the skin folder of your choice in adt-bundle-OS_VERSION\sdk\platforms\android-XX\skins directory.
And now, some screenshots...
Please note that these captures don't look very neat, cause emulator was launched so as to represent real size device on my 13.3" laptop. However, all my skins are available in full resolution, and cover nearly all kind of definitions (from 320x480 to 1080x1920)
HTC One (M8)
Samsung Galaxy S4 Mini
Samsung Galaxy Ace
Samsung Galaxy S5