I think your on the right track when using simple blocks and colors instead of over-detailed textures that just cannibalize on the game design. Try using particle and sound effects instead to make it feel groovy.

We got our first real in game picture up showing the graphic style of the early beginner level boards.
Over the past month frustration grew in the BlockZter team as due to various circumstances the team was reduced to four, at the same time we did graphics theme upon graphics theme, and while they all looked great, they kept being too obstructive for the game experience.
Finally we tried a whole new approach and stripped the style down to a clean, simplistic board style with less colors and props in the board graphics. The result was what we were looking for. Although the old graphics were nice eye candy, they ended up confusing the player as to what was of importance on the board.