I greet the inhabitants of this site!

I greet the inhabitants of this site!) I congratulate all with new year and Christmas holidays!! I have a question for the admins - in skladyvaetsya puzzles have options for the replacement of the background (white and three shades of gray), and whether in this palette to add a few (red, blue...) sometimes these speckled pieces of the puzzle happen, which is very hard to see that when a dark background that is light gray. However if such an experiment has already been - and it didn't work (in terms of efficiency), then I have no more questions) Thank you for your attention!)