Love designer vases, but not the price? (Sounds like a pitch I know *smile*). Head over to your local Dollar Tree and purchase some glass vases. Using craft paint (I used left over outdoor craft paint), pour some into the vase and twirl the vase around (using your hands) to get the paint to move. Using a second paint color randomly pour it onto the internal sides and continue hand twisting the vase. When you have the majority covered, place the vase upside down onto a surface and allow the excess paint to drip out. This will create random streaks much like those expensive designer vases in those bed and universe places.
Expect an over night to possibly 2 days drying time depending on how much paint you used. Once dry, I sealed it with a layer of Mod Podge for a glossy look. Remember that this project is for decoration only and I would not suggest eating or dining with painted glassware. Enjoy!