Your quilt is CUTE!!!!
OK, I would NOT do pebbling - as someone else said, you would "lose" your snowflakes.
Instead, I would "echo" about 1/4 - 1/2 inch out around each snowflake, then a very OPEN (not dense, and not a lot) loop-de-loop, sort of make it look like the wind swirling the snowflakes.
On the narrow, red border, I would pebble that, and piano keys (somewhat wide) on the outer border.