On my latest trip to the library I've discovered this wonderful book.
I've had exactly what I needed to complete the project featured on the cover:) Lucky, ah?
Materials needed: glass bottles, masking tape, paint suitable for glass (I've used Krylon)
Clean the bottles and remove all tags.
Create the pattern using masking tape.
Paint the bottle and let it dry.
Remove the tape and reveal your new treasure:)
Very easy! Have a great day.