My sewing table is now covered in bits of yellow (and some more orange) fabrics most of which won't work, once I've put away the ones which don't work at all I'm left with a very pale yellow, a mid yellow with pinkish bits and a small geometric gold print.
from top to bottom
very pale yellow
the fabric I picked previously for the Light
a yellow with pinky bits
egg yoke yellow with gold bits
the honeycomb fabric I picked previously for the Mid
the I picked previously for the Dark
the floral which is the right colours but very odd shaped scraps
The yellow and gold one is a possibility I suppose, though only 13 x 16 inches so not enough fabric.
From your MEDIUM fabric cut SIX 3" Squares - You are going to be making FIVE of these blocks in total
So need 30 3 inch squares - out of 12 x 15 I'd only be able to get 20 3 inch squares.