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I am trying to make gravel underneath this track using a particle system and a weight map.

However the rocks all have the same rotation and are arranged in a grid-like pattern and I can't see any option to randomize these.

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These are my particle settings.

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I haven't been able to find any tutorials on this so some help would be greatly appreciated.

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    $\begingroup$ You can always edit your question to add new information. Not everyone will look at the comments :) $\endgroup$ – Timaroberts Aug 25 '20 at 5:52
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    $\begingroup$ Does this help ? blender.stackexchange.com/a/109818/86891 tldr : Enable "Advanced" at the top of the settings and a new "Rotation" panel will appear. Also the settings to randomize placement are under "Emission / Source" $\endgroup$ – Gorgious Aug 25 '20 at 6:24
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You could try a couple things to improve your results. One is to use Brownian Force under the physics properties of the particle settings. From the manual:

Brownian

Specify the amount of Brownian motion. Brownian motion adds random motion to the particles based on a Brownian noise field. This is nice to simulate small, random wind forces.

Also, you may use the rotation values, which does provide a random parameter underneath the advanced tab.

Here are the settings that I used:

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Furthermore, using multiple objects will help in your instance collection. The repetition will not be nearly as noticeable if you use 5 or more objects as if you only use one.

Here is the result:

enter image description here

As for the grid pattern, you can vary the density of your density group when you are in weight paint mode if needed. This is an image of my example:

enter image description here

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