Diablo 3 Theme for Diablo 2 .txt install read me is included theme has Wings, Pets, Monsters and even Battle.Net is just like the main menu so nothing is missed.
Here is a D3 styled theme for Diablo II, to install there is a read-me or just drag data to your D2 folder along with your game exe and then create a shortcut of game exe if you havent got one already put it on the desktop and right click to properties over your shortcut and were it says blablabla game exe put -txt -direct at the end of it and click ok or apply, this is safe I've been using GUI Themes since i started playing and blizzard put that option there for a reason enjoy.
Diablo II (Diablo III) GUI Theme 1.14d
Version 1 Update
Version 2 Update
-Town & Identify Colors
-Storm Caster Replaced
Version 3 Update