Hi Bill, if I were going to recreate these, here’s what I would do:
The first table (with the red) looks like someone created a rock formation in between the two wood sections that is illuminated from underneath. I would make that first, then fill in the area with clear resin.
For the blue table, it looks a similar process, except the artist also included blue glow in the dark powder. (We have that here: https://shop.resinobsession.com/collections/colorants/products/day-glow-in-the-dark-powder-for-resin) It looks like there is also a clear layer on top of ‘blue formation’ as well. What I can’t tell is what created the other colors of blue. Perhaps someone painted them on a 3D surface or created them with resin mixed with blue (i.e. resin painting), but it’s hard for me to tell without a closer look.