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I was fucking around and found a fun way of livening up old and/or low res wallpapers, and I'll be dumping some and sharing the technique. To my knowledge this will require photoshop.
>open your image in PS
>shrink it to exactly half or a quarter of your screen's resolution
>gaussian blur if desired
>save for web as PNG-8 using "Restrictive" color reduction and "Pattern" dithering, setting colors to "Auto" or your desired bit depth
>close, and open your newly exported file
>upscale the image to full res using "Nearest Neighbor" in resampling
>win
>open your image in PS
>shrink it to exactly half or a quarter of your screen's resolution
>gaussian blur if desired
>save for web as PNG-8 using "Restrictive" color reduction and "Pattern" dithering, setting colors to "Auto" or your desired bit depth
>close, and open your newly exported file
>upscale the image to full res using "Nearest Neighbor" in resampling
>win
