Okay, I'm pretty new to phreaking and electronics in general. I've built a basic beige box and i'm looking for a bigger challenge. Besides the red box, what are the other boxes that are made for novices?

P.S.
I found my telephone box on my house and i plugged my beige box in and it worked fine. Are there boxes like these on EVERYONE'S house?
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"Nothing from no where I'm no one at all. Radiate. Recognize one silent call as we all form one dark flame. Incinerate."
~~~A Fire Inside [AFI]