DragonHeart said:
Meh, mine ended up mostly off-white, with a small section of brown and a smaller section of red. I thought I was slightly more interesting than that. Oh well, I'll just have to take that again in a few years and see what happens.
~DragonHeart~
See, the truth* is that Mondrian found bright colours boring. He reduced most of his canvases to contain only horizontals and verticals, with primary colours. These, to him, were the building blocks of our world. In order to re-invent the human social environment, he first had to decompose it into its basic elements.
Therefore, in Mondrian's world, secondary and compound colours are eminently complex and sophisticated. However, diagonals would be heretical, and curves would be simply absurd.
So, if your image came out as subtly-coloured rectangles, you're obviously an incredibly interesting, profound soul!
*: I'm really just winging it based on fading memories of art history class.