When I think "quilt" I think roughly queen sized as are most of my projects. I've gone larger including a full 3 yard square king Log Cabin that I also simply grid quilted with my little old vintage sewing machine. Wasn't fancy but held up well -- better than me! I was crunkled for weeks and that was 20 years ago.
So for me a nice little crib size is a quick fun project, make it in adult colors and maybe 6" bigger and call it a comfort quilt. Going to make a preemie quilt this weekend, that will be like the equivalent of maybe four blocks and a border.