This is a paper version of TechNerd1012's "Super Mario Bros. Question Block." I made this Instructable for the simple reason that I had no balsa wood and wanted to make a question mark block. I thought deep in the memory banks for a way to make it out of paper. After 5 minutes or so in MS Paint, I created a net that can be folded and taped into a cube. This Instructable will teach you how to tape the cube on the inside and the outside, but the pictures only show how to tape it on the outside. This Instructable is being posted with permission from the author of the original. Also, scissors can be kind of dangerous, so don't be stupid and cut yourself. And with that, on to the Intsructable!
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Here's a link to the original; the really really cool project that this Instructable was based on*
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And here's the eBay listing **
***This is also an entry in the Pocket Sized contest, so please don't forget to vote!***
http://www.papercraftmuseum.com/question-block/
http://www.papercraftmuseum.com/brick-block/
And just for your Mario 'lovin pleasure, also found the Super Mario World block set there too...
http://www.papercraftmuseum.com/super-mario-snes-blocks/
Might be more there along those lines, but I just did a quick check.