I think the squares are going to be more interesting if we do them like very small pictures (that's the challenge!) more than abstract ones. . Of course, if you are more at ease working abstract, please do. I mean, it would be nice if they have at least some dot or line or whatever, so that the eye can wander through the whole piece. We are very democratic here! you can share your point of view and everyone can decide what to do at the end!
You can do many different things with the squares when they're ready. You can sew them together like in the picture of Dotee but you could also use them for other mountings.
I'm playing with the idea of mounting them as a house. You could use other forms like shrines, boxes, whatever...
It is easier to do the same small picture 9 times in the different colors as imagining 63 different ones!! If you want to do 63 different ones, you're allowed to do it (and you get my blessings for doing this extra work!:-)
You can work on paper or fabric or non-wovens, or whatever you can sew through!! but keep it mostly textile!
Please add to this considerations, we can help each other with ideas!!