SUMMARY ON WHAT THESE ARE:
Long long ago before I started playing Blockland, I was really really creative and thought out of the box.
I made custom Lego parts for a parking garage idea and things like that. I decided on something cool one day. I bought a simple generic Jenga-like game and thought, "Why not use playing cards and these blocks to create mini skyscrapers?"
And so be it. I made some cool things. I used almost all the blocks to make one infinite tower or a Sears Tower like tower.
HOW TO MAKE THESE:
Really all you need is one box of Jenga blocks and a deck of cards. You can basically make small skyscrapers or huge ones that require a stepladder (Never done that, but I really want to buy a stuff ton of blocks for that ;D.)
The result could be this:

^click for bigger image^
That's just the beginning. I almost forgot about these until I made a quick trip to my grandparents' house and grabbed my bags of Jenga pieces and dominoes.
You can literally get these 2 things for probably under
12 bucks.Jenga is $10*. A deck of cards is not even a dollar*.
*Info gathered through Google. I tried to give links but Badspot has some system where I cannot share the links. It's a really cool thing to do if you are bored, and I'd recommend trying to build some. You can also use dominoes!
Feel free to discuss + Share your buildings if you tried!