Non-isometric, more stylized pixel art collab. Like stuff that would actually be used in assets of a game or something.
Maybe a joint mockup, where there is a list of tasks such as grass tiles, dirt tiles, rock titles,character sprites, etc. Each person snags a task and has x amount of days to contribute. The final picture would be a tile sheet that each contributor could arrange into their own mockup.
Or something like a GB color palette collab where each person gets 4shades to work with and each picture will actually be a different shaded pixel within a larger design. So more detailed little 4x4 8x8 or 16x16 squares used to form a larger, more minimal arrangement.
Something along the lines of that, i found the other pixel collab rather boring because it was a set isometric style that wasn't very free to work with in terms of character. Subject matter and quality may have varied but all in all it all looked too hooked up to a grid for my personal taste.
Im not saying i would do any of these any time soon, im a bit busy. Just wanted to clarify that i was not referring to the other pixel collab.