Who stopped you?
The Texas law prohibits any color lamp other than white or amber to the front. Yours don't look blue to me, but I didn't see them at the time of the stop.
547.305 talks about the color. It mentions blue when referring to a beacon. I say a beacon is a rotating light. Yours isn't a beacon.
Sec. 547.305. RESTRICTIONS ON USE OF LIGHTS. (a) A motor vehicle lamp or illuminating device, other than a headlamp, spotlamp, auxiliary lamp, turn signal lamp, or emergency vehicle, tow truck, or school bus warning lamp, that projects a beam with an intensity brighter than 300 candlepower shall be directed so that no part of the high-intensity portion of the beam strikes the roadway at a distance of more than 75 feet from the vehicle.
(b) Except as expressly authorized by law, a person may not operate or move equipment or a vehicle, other than a police vehicle, with a lamp or device that displays a red light visible from directly in front of the center of the equipment or vehicle.
(c) A person may not operate a motor vehicle equipped with a red, white, or blue beacon, flashing, or alternating light...
547.3215 is probably the most important and overlooked code in the Texas Transportation Code. It basically says if the light is "DOT" approved, or "Complies with 49CFR - 571.108" then it is legal.
Sec. 547.3215. USE OF FEDERAL STANDARD. Unless specifically prohibited by this chapter, lighting, reflective devices, and associated equipment on a vehicle or motor vehicle must comply with:
(1) the current federal standards in 49 C.F.R. Section 571.108; or
(2) the federal standards in that section in effect, if any, at the time the vehicle or motor vehicle was manufactured.
Any unapproved light, or modification of a stock lamp that renders it non-compliant, is a violation. Examples include lights with VHT coating applied, or HID headlamps on vehicles not equipped from the factory with them.
Our (DPS) standard is based upon what color the light is that strikes the roadway. In regards to headlamps or driving lamps, if the light is any color other than white, it is illegal.
Good luck!