I copied this idea...
...and made these photo cubes for my dad and father-in-law for Father's Day.
I chose to paint mine black.
I like my modge podge shiny so I always put on several thick coats. That is why the flash looks funny in this picture.
One tip: the tutorial says to use a 4x4. I went to Home Depot and asked the guy there to cut two pieces of 4x4. He told me that a 4x4 is actually not 4 inches, it is a little over 3 1/2. So if you make it, tell the wood cutting person at Home Depot that you want a perfect cube.
This was super cheap. You have to buy the whole 4x4, but it was only $5.96 (now I have like 6 feet of 4x4 for some other random project I have yet to come up with). Definitely a recession-proof Father's Day gift.