Art.sy is a site that contains art of different types and media. I have found that browsing it (and other art sites) has given me ideas on color combinations and graphical styles I wouldn’t otherwise have thought of. Hopefully other folks here get some inspiration from it as well.
The landing page makes it look like you need an invitation to browse, but just click on “Explore Art.sy Without An Account” below where it asks for your email.
Anyone else have any sites they find useful?