Ahh it feels awesome to have a customized Web Client!, I know this is possible with VCenter Web Client, but it was totally different for ESXi HTML5 Client.
Background Image + VMWare Logo + Loading Gif
Home Page Tower Image (not changing Logo above follows you throughout App!)
Change overlay image AKA cloak on Powered off VM's
Change GIF when you refresh page
HUGE shout out to two websites for the GIF's!