Every time my son gets a new LEGO set he builds it, plays with it, and then throws it in a tote with all of his other LEGO sets. All the parts get jumbled together and the possibility of ever putting the model back together drops with each new set.
This Christmas I decided to try and stop that cycle by creating some shelves for his room to display the completed models and while I was at it I created a shadow box to display some of his favorite minifigs.
The shelves are just a wooden box made with 1" pine. This is a three foot shelf so each section is 12" wide and 10" tall.
For the minifig display in the middle I used 1/4" MDF cut to the dimensions of the opening. I then painted the MDF and used Gorilla Glue to affix LEGO bricks to the MDF. The minifigs snap onto the bricks and he can swap them out as he wishes.