I think I am correct in saying using more light and reducing the ISO will reduce the noise in the pic...
But, otherwise it's very cool. Really, REALLY nice colours! How did you get them?
Nice start Instead of the ceiling try placing a piece of paper behind the drop and bouncing the flash of that - you'll lose less light whilst keeping the high speed element of the flash. Shounldn't need to go above iso400
Here's a good tutorial I started with:
http://strobist.blogspot.com/2009/05/how-to-photograph-water-drops-with-one.html
HTH!
Its a lovely start, Im still working on improving this type of shot myself.
Thank you So much This is really going to help!!