A couple notes on the emu-mod: The sprites are sized up 4x - this means you need a good video card because I had to move the vdp to pixel-shaders (Trying to do 16x the amount of rasterization work on cpu is an insane idea). Second - Yuski has the right idea here. Look at what capcom is doing for SSFT2HD, and use the sonic 2 concept art as a source. It is far more detailed than what pixel-art would allow for. This is the entire reason for going to these high-res sprites. You can add detail and colors and such that just weren't possible on the old hardware. Another example is actually the large-scale logo for sonic-retro. If you want it to look the same scaled down, just play the original game. If you want a smoothed out look, just use one of the 2xsai type filters because it's going to be far easier and run better that way. People's jaws aren't going to drop if you just make the graphics look a little less pixely or whatever. Overhaul the hell out of them or it's not worth it. I have a sketch at home of the sonic standing sprite HD-ified. I'll post it here when I get a chance - it's faithful to the old art style, to the concept art, and takes advantage of HD graphics.