I think you're on the right track. Most people go for the easy out for PoV, such as Bram. I have done these shots with many, many misses. But every once in a while, you hit on a winner.
One of the issues I see with your shots is that the background is competing with the subject and winning. I have found that if the background colors are set back a fair distance from the focus point, you get a much more pleasing effect. I use a macro lens as well. You can see from this setup shotthat the background colors are ~24" behind the focal point and extend below. This was one of the results. Another setup, another result.
It really a matter of timimg. The more you try, the more you'll delete.
yeah, I had an sb600 at the same height as where the drops were hitting, 2 feet to camera right, bounced into different color t-shirts to get the colors
Ideally, I would use 2 flash units at the same time. However I only had one at the time. I'm planning on doing it again soon now that I have 2 flash units.
Get creative w/ your shots!!! Think out of the box!! Everyone has seen water drops.....make yours stand out in some way. I took some w/ sparkly Christmas paper and they came out kinda cool.