Thx for the comments.
@Tom Mann - I tried a few times to get a natural looking cork, but in the end I plumped for this simpler "synthetic" one, for the main reason of tiling. The seam isn't noticeable when you apply the pattern to a large area. I do like what you achieved though, I agree it's not the easiest thing to create completely digital.
The project result I was going for is this. I want to add some more choices to it also. It's basically a noticeboard. Which can be customised using the different choices, rotate each pin separately, etc. It can be for a desktop wallpaper or website elements.
I'm still debating whether to add a border, & how I would achieve a really nice one.