Sure, there are LEGO bricks that light up, but do they blink in different colors? Brick Brites are motion activated pieces that work “with major toy brick brands” and blink when tapped, which helps conserve battery life. That’s good, because I don’t see a way to change the batteries. Comes in White/Red, White/Green and White/Blue for $9.99 from ThinkGeek.
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That is a great idea! Why they never came up with all the cool stuff when I was a kid… But I have LEGO Mindstorms so hope is not lost yet.