My inspiration is leaves - yes, I know it has been done before, but actually perhaps that makes it even more of a challenge.
My starting point was a Zentangle - or organised doodling. And it really does free you up.
Then I did a bit of doodling in colour.
And then I decided to do a bit of printing, making blocks with my materials of choice - sheets of play foam and old polystyrene pizza bases.
Here you can see a couple of blocks using the sheets of foam that you can get from places like Hobbycraft. It is easy to cut with scissors or a craft knife. You might recognise the inspiration for these blocks (well, the ivy excepted) from that original zentangle.
Below are the results, and I am rather pleased.