Most are wall size. I have done bed size with a technique I developed called Watercolor by Number. Watercolor by number uses only 10 floral fabrics or less and combines them with a traditional quilt pattern. I have had one student who put a light border around the watercolor crucifix and it looked great. I have flannel design walls.
White flannel is important.
People try to use colors or the back of a table cloth- and it confuses the design. I just saw your cross wallhanging. It's my best selling pattern. I used to hand quilt everything, but time does not allow much of that anymore. I do like to hand quilt in the light areas of watercolor quilts where it can be seen.