Rendering

[Sharlybg]

How would I create something that looks like this:

BTW with luxcore it is a good thing to work at object real world scale. It is going to save you lot of headaches

[Skilled420]

Why would be better?

[B.Y.O.B.]

How would I create something that looks like this:

I would try a mix with rough glass, maybe driven by a texture for the mix amount.

BTW with luxcore it is a good thing to work at object real world scale. It is going to save you lot of headaches

Why would be better?

This is a good idea most of the time, not only with LuxCore. It ensures correct light falloff behaviour, makes it easier to re-use assets in different scenes, and makes adjusting stuff like bump height or photon radius less of a trial-and-error process.

I rendered your scene with path + light tracing + caustics cache by the way, which is able to show SDS paths like the caustics mirrored in the side of the glass: