The trick i am going to show is awesome n everyone can do it ..
No need to build any thing new ...

Here is the trick ..
Every time we want some water droplets effect in any pic on some object (like flower, on human body ( model ),glass , or drop on mobile's screen )
Note : iphone also have some this kind of background with droplets

what you need is...
1: sprinkler
2: any mobile camera ( 5 mp + would be better to use ), DSLR

Making Sprinkler
a sprinkler could be made out of any bottle of scent or or body spray
use any old bottle n empty it out .. fill water in it and tadahhhh... you have your own sprinkler

Step 1: Find Object , Sprinkle Water N Click Images

whether its the Flower from your garden .or drop on ur screen.. or waterdroplets are on glass of car
(Note : Above all these are my cases)

Its Your turn to try this out ....

So get a Sprinkler n Sprinkle water on different objects n get best n beautiful out of it .... here are my few shots ...

Email me : Dilroop.singh@gmail.com
or comment below about this trick