Discover
Rainmeter comes with a few simple starter skins that provide a good place to start, but the biggest part of the community are skins which you install onto your system.
You can place them onto your desktop and modify it so it will fit to your current systems theme to create something special and unique.
DeviantArt
deviantArt hosts one of the largest online repositories of Rainmeter resources. Check out the Rainmeter Group's curated gallery or the Rainmeter Category gallery.
Reddit (/r/Rainmeter)
The Rainmeter community on Reddit is a great place to get ideas and tips for Rainmeter, see and share things people are creating, and get involved with others using Rainmeter.
Rainmeter Forums
It's a little-known fact that many of the most fresh and innovative skins are being developed right here in the forums on rainmeter.net.
/r/Rainmeter Discord
The unofficial /r/Rainmeter discord is a great place to chat and exchange with other users about desktop setups and skins.
Lifehacker
Many of the most creative minds are continuously posting screenshots and details on their Rainmeter-incorporated desktop setups in the official Lifehacker pool.