I made vegtal decorative table using a big terra cotta pot, on wheels to move it easily, even if it would be occasional.

I put rubber tips between the rim and the glass to avoid scratches and to improve the grip on the pot.

Supplies

Big terra cotta pot - height about 65cm - diameter on the rim about 50cm
Wood tray on wheels - the diameter of the tray should match with the bottom of the pot and be able to support the weight of the full pot
Round glass plate - diameter 80cm - thickness 10mm
Transparent rubber tab (the ones used to absorb cupboard doors) - diameter 22mm - thickness 3mm - 18 tips
Rocks - enough to fill half of the pot and create relief
Geotextile fabric or jute or thight grid
Plants (selection described in the next step)
Soil compliant with chosen vegetals
Decorations - set of miniature garden furnitures

*** Some tools ***

Step 1: Vegetal Selection

To chose plants, I took 2 criteria into account : hardiness and size

Plants must be resiliant to summer and winter climate - from -10°C to 35°C
Final size should not exceed about 30cm, in order to keep seeing properly inside

Finally, I picked up vegetals from my garden and cuttings :

Soil = 3/4 soil from my garden + 1/4 from compost

Set the pot on the tray; center it to avoid tipping over
Put the rocks onto the pot; arrange rock's disposition to create relief. I use among others old concrete blocks and smaller stones. Rocks should fill about half of the height.
- Make sure the top of the relief is below the rim of the pot

Fill about 1/3 of the remaining height with soil mixture
Arrange the plants; there must be enough place above it to grow up above the glass plate
Add soil to steady the plantations
Add moss - I filled in the gap on the top the concrete block and put moss on it to make the relief more attractif
Sprinkle in fine rain
Settle the miniature furnitures

To manipulate the plate, it is less dangerous to be helped.

Measure the diameter of the middle of the rim (diameter of the circle following the tips) - 49cm
On the glass plate with the erasable felt, trace 6 marks distributed on a center circle of 49cm of diameter
Put the tips next each mark and erase it
Put the plate on the rim of the pot and mark each tip position with pencil
Remove the plate
Stick 2 tips on both sides of each mark, let the place for a little more than one tip bewteen them
Reinstall the glass plate

Keep wet, using spray
Check condensation, if there is too much, remove the plate during a couple of hours, such as for a terrarium
In summer, if the table stay in the sun, place a mat to proctect plant from sun as it can is done with shade sail in greenhouse when there is to much sun outside
Replace unsuitable plants (too big, dead, ...)
Add 1 or 2 handfuls of compost once a year