Is there any significance to the blue and white Chanukah candles?
None whatsoever. Chanukah candles can be any color, shape or size (provided that they burn for the minimum half hour, or one and a half hours on Friday night). The colored candles are apparently a desire to add an aesthetic touch to the holiday, and perhaps make it more appealing to the children. And certain manufacturers decided to give Chanukah a unique color theme, too. The blue and white of the Israeli flag appealed to them, and thus the reason for the proliferation of blue and white Chanukah candles.
