Upload & Sell: Off
My thoughts would be that for that price, you're not really getting anything special or helpful. There *are* similar looking options that have more lenses that allow the unit to be much more focusable that allow you to really project images/shapes (usually meant to create harder lines).
If you're looking to add patterns/randomness/texture in the background, you can do so MUCH cheaper (and I'm not a DIY nut).
1) Buy a roll of black cinefoil. This stuff is incredibly useful (can use it to make snoots, flag lights, etc), but specific to your needs, you can take a knife/screwdriver to it and make some random cuts/holes/patterns. Clip this to your light, and you're good to go. This is called a cookie. Much cheaper, and many more uses than that which you linked to.
2) Use a bowl/fishtank/vase full of water and shine light through/against it.. The randomness of the water reflections can be great, and if you really want to mix it up...have an assistant slap the side of the vessel from time to time to keep a bit of motion in the water to ensure randomness.
3) Put a houseplant in front of the light. The leaves at different distances from the light will give texture with varied hardness to the shadows on the background.
4) If you want harder edges on the pattern, pull your light back and use a larger cookie. You can buy duvetyne fabric (also known as commando cloth) which is completely opaque and absorbs light...and make cuts/holes/gashes in it (just like the cinefoil) and keep it closer to the background.