First, unlock a Vanish Ball. Go to any kind of stage in the Creator Mode. Then, throw the vanish balls at the scenery in the background *Like buildings, bushes, audiences, etc.* They should disappear. Some things won't disappear, like the buildings in the City Stages.
Next, make a level and put a whole bunch of blocks in the air (I mean a lot) that are painted so they are Hull Blocks. Select the Laser Gun as your tool. Now, when you play your level, the blocks should be in the air, and will not fall to the ground. That's what hull blocks are suppose to do. Shoot the hull blocks with your Laser Gun. After 3 hits, each block will disappear. After you shoot and destroy a few of the Hull Blocks, all of them will fall to the ground. The game glitched and the Hull Blocks lost their ability to stay in the air.