Inky darkness, because everything is scarier in the dark; if we can't see then our other senses take over, every sound is amplified, every creak, every echo sounds suspicious, every shadow hides - who know what? We hide under our blankets and wait for the safety of dawn. Shadows may be scary but they do make great silhouettes perfect for stitching, either black on white fabric or how about black on the new glow-in-the dark fabric from Sewitall?
But, without the dark we would not be able to appreciate the light:
What is an imp? A small demon who is more mischievious than harmful. Perfect for some trick or treating on Hallowe'en. I found it rather difficult to find cross stitched imps but Nimue does have Mic and Mac who are rather sweet: