I hope you find something to your liking as the site is regularly updated. Key F11 on your keyboard to gain maximum effect (Keying F11 again will return you to your previous setting)
The large version of the sample image below can be found in the Gallery identified. (The slide show option is recommended...)

"Different"

Contrast checker
For optimum viewing, calibrate your monitor to see all 16 shades from pure black to pure white.