I've been searching for signal light bulbs (1157) that match the bluish color of my headlights for my accord for months, but I can't find anything that comes close. The Polarg 35W/5W bulbs I'm using are slightly blue, but look very yellow next to the headlights. It's not that big of an issue, but I've seen bulbs on other accords/integras that are brighter and bluer, so I'm determined to find them. Any suggestions?

I doubt the other bulbs you have seen are brighter than your Polarg M12. M12s run on a 35w high fillament. Now, if you're running on the low wattage 5w fillament, then theres your problem. Change your setup so you're running high, and not low... that way, it will look white, with a slight blueish tint, and be almost as bright as your headlights. Polarg advertises their bulbs to produce double the ammount of wattage they actually are. A 35w output is advertised to look like a 70w output bulb. Also, if you want to continue to run low watt fillament... then try using Polarg's M27, which runs an a low fillament of 8w, vs just 5... which should make a slight, but noticeable difference.