Here's a 4-in-1 multicart I made to test I-CHR which is a tool to convert PNGs into CHRs. I've used I-CHR on SF-1010 before, but this is the first time I used with a non-emulator screenshot (in this case, the LoveLive Days art of Ren Hazuki from LoveLive Superstar which I found on
LoveLive Wiki). The convertion process is not that straightforward - I have to reduce the color in Paint.net and change the palette within NES palette limitations for the best results. The end result is cool regardless. (Also I used a self-modified version of Sonic 3 Special Stage music from Famistudio's examples, of which I removed Namco 163 expansion audio. )