I've seen this used as a tablet background and really like it. I would like to model a few meshes and have them filled with small objects like you see below to achieve the same result. I'm wondering what would be the best approach - could a particle system be used for this or should I maybe focus or something else?
You can do this with particles. Just create meshes to the shapes you'd like and spawn sufficient particles all over.
Alternatively, using the same meshes, go into Geometry Nodes and use the Distribute Points on Faces node with the Instance on Points node.
See the screenshot below where I show a simple example with the default cube where I instance (in this case, itself) over points which were generated by the first node.
To instance another object besides the source object, add that object to your scene, then you need to add it into your node setup with an Object Info node, then use the Geometry output after selecting your new object.
Whether you go the GN or particle route, I'd advise using very simple Icospheres or Cubes for your case, as they're tiny points and don't require much geometry.
Play with the Density on the Distribute Points on Faces node until you get the desired result.
Edit: You can randomise the size of your instanced points using a Random Value node. By default, it gives you a single value with a grey output BUT if you change it from Float to Vector, it'll change into three values with a purple output. You can then plug this into your scale input on your Instance on Points node.
The rest is self-explanatory! :)
