This wall hanging (or kids quilt!) is a great exercise in fabric play. What secrets will your fabric reveal? It appears that you are looking at the fabric through a magnifying glass.
Any fabric will do but you can really accentuate the magnified effect if you choose fabrics that have both small and large elements and then fussy cut the required pieces. Extensive tips and photos on selecting fabrics are inside the pattern.
The blocks are simple to construct. The only tricks are: fabric selection and a very consistent seam allowance.