Try something colorful like https://upload.wikimedia.org/wikipedia/en/thumb/3/39/YoshiMarioParty9.png/175px-YoshiMarioParty9.png
RGB:
Terminal Preview:
Note: this terminal can't show all colors, but most (xterm, cmd, Git Bash) will.
For best results with ANSI colors, use this palette in source images:
© Drew Harwell