I have included written instructions for both corner to corner and for single crochet too, but as the image is a graph you could make it in any sort of stitch you like! You could even knit or cross-stitch it if you wanted to!

To make this blanket as I have done, in the mini corner to corner stitch you will need:
3.75mm crochet hook
500g light grey
100g each of dark grey, blue and pink
50g each of red, orange, yellow, green,
Yarn needle, scissors and all those odds and ends