I can do 12-24 quite easily if I change up the fabric in each block. I stick with a color scheme and most of mine are patriotic colors. I chose a light background---sometimes all the same sometimes just light. They I use different blues and reds.
I can do a quilts for kids pattern over and over using different fabrics each time. I make Warm Wishes also alot and do not mind that at all. Or a patriotic star pattern using different fabric.
I would not like using the exact same fabrics for all the blocks in a quilt. I like seeing how many I can fit into one quilt all from stash which is ample.