Ok Zoe.
I used this texture which I found on the internet. I will call it Tex1.
I thought it was a bit too intense for the effect so I used parts of it to make a brush.
First, I removed the white BG using Color Range.
Next, I opened a separate document that was 500px x 500px. I gave it a white BG.
Going back to the Tex1 document. I used the Lasso Tool to make selections of areas that I though would make a good brush.
I copied the selection, moved over to the 500px x500px document and pasted.
I did this two more times.
I did have to use Free Transform to rotate some of the selections.
When I had the selections the way I liked them, I made a brush out of them by going to edit > define brush preset.
Now that I have a brush, I was ready to create the texture from your example.
I created a new document.
Once I had the Green BG, I created a new layer for the brush work.
I selected the Brush Tool and the Brush I had created.
I set the Brush Tip shape spacing to 200%.
I set the Shape dynamics :
Size Jitter to 30%
Minimum diameter to 5%.
Angle Jitter to 20%.
Roundness Jitter to 8%.
Minimum roundness to 16%.
I made some Brush clicks on the BG.
I set the blending mode to Soft Light.
I lowered the opacity to 40%.
That's about it! You can play more with the brush settings to refine the effect.