You or your kids have LEGO figurines and you want to expose them? This is really simple!
Step 1: The Panel
Take a wood panel (medium is OK) with something like 5 mm thickness.
Draw as many 1/3 x 2 profiles you need on a vector file (I personally use Illustrator)
I have put 30 mm of horizontal distance and 75 mm of vertical distance between each.
If you aim to fix it on a wall, think about holes for fixations.
Panel is cut with a laser cutter (difficult to imagine another tool to do it!)
Step 2: Finish
I have painted the panel in white and ordered some 4 x 2 x 1/3 LEGO pieces.
Simply position your figurines on your panel!
The good thing is that you can still move them as you want!