Holofoils
Inspired by the pretty shiny cards in many TCGs (Pokemon especially), these are repeating patterns that have a rainbow or otherwise shiny animation to them. Among other things they can be used for site backgrounds, icons or tcg card edits.
NOTE: If these backgrounds feel too small, you can always multiply their sizes by even amounts (usually x2 or x4 works) to keep their nice even pixel look. Just be sure to resize with hard edges!
Other Backgrounds