We did a quick little search and pulled up wallpapers, themes, handbooks and countdown widgets. Some are free, others will cost you a few bucks. We thought we would drop one that we found here for quick install, and let you search out others that might be even better. Here is what you will be getting with YT‘s  Diablo III Guide –
Provides information about Diablo III.
Diablo III Guide contains content:
=== Classes ===
Overview
Active Skills
Passive Skills
Skill Calculator
Progression
Filter
=== Skill Calculator ===
=== Artisans ===
Overview
Recipes
Progression
=== Followers ===
Overview
Skills
Skill Calculator
=== Items ===
Armor
Weapons
Other
Filter
=== Archived Content ===
Diablo 15 Year Anniversary
Classes
Bestiary
Environments
Diablo Timeline
Systems
=== Expanded Universe ===
Wayfarer – Barbarian
Hatred and Discipline – Demon Hunter
Unyielding – Monk
Doubtwalker – Witch Doctor
Firefly – Wizard
Application: Diablo III GuideÂ
Developer:Â YT
Cost:Â FREE