QUICK! put a lava block on top and make yourself a Lava Pyramid
Lol, I have already done that on a few occasions.
The problem with that is that this pyramid is "aligned" with the world. In this orientation, I'd need to dump a bucket of lava at every corner of the pyramid, on every level. That's around 400 buckets of lava, I think.
This time I wanted an egyptian-looking pyramid. The top is even made of gold blocks, but it doesn't show up very well.