Today I have a tutorial that introduces you to a dimensional spray called Goosebumps, and shows how it can be customized with color to create a waterdroplet effect.
I used India Inks in the video to color the Goosebumps, but you could use other inks such as the Tim Holtz Distress Ink in reinker bottles. You could even use spray mist, though the higher water content in those may dilute the Goosebumps causing the bumps to be flatter than usual. Experiment and see what you can come up with! There's no such thing as failure here -- just learning experiences. :)