Ideas to photograph at home
Oil on water
Soap bubbles/soap suds - lit up to show irridescent rainbow colours - here is a link to show how to obtain these colour abstract images. Soap bubble technique
Refractions in Droplets on wire or stem/flower
Raindrops or spray on glass ( or other surfaces) - Handy as textures but also can make wonderful abstracts. This one below is just water sprayed on glass with flowers underneath.
Droplet Splash or droplet collisions
I've not done this in about ten years, so excuse the low res pics. You don't need expensive equipment - some aquarium tubing and a valve to sort drops out, its not so easy getting the collisions this way but I did manage some. Best to read up how to do this for good results - I used to set up in a dark room to avoid ambient light causing issues and adding various substances to your water/liquid can help get more interesting results ( I seem to remember a lot of people used to use something called Rinse aid). A couple of flashes that work at 1/128 speed are very handy too. Its fun and addictive. Try using a a CD for colourful reflections for something unusual or add milk to the water dripping into the bowl. I used to challenge an old friend to produce more creative droplet collisions giving him the idea set ups as he was so much better at it then me - from wine glasses, coffee cups to a boiled egg shell or mushroom.
Liquids jumping due to vibrations
Another thing Ive not tried myself but would love to. If you type in "Paint on speaker " into your search engine or youtube you will get to see pics and videos. They're very eye catching.
Liquids in bottles or glasses and dripping ink/paint/milk into water
Check out the wonderful creative splash art by Mark Hunter for some creative inspiration using glasses, bottles and much more Mark A Hunter Photography He has also put together info on mixing liquids for photography liquid photography
Ice cubes or containers of ice with items frozen within
Reflections - either at home or on a walk
Items being dropped into water or actually submerged in water - this is a really old pic - I will post a better one soon
Abstract images using ink/paint and alcohol ink or nail varnish floating on water
Make it rain - spray water in a scene and capture the droplets falling either frozen still or using long exposure
Droplets on top of a CD ( Another old pic from about ten years ago just to give an idea)
Freezing bubbles in the snow or in the freezer can give fun effects
How to photograph bubbles in the snow