Here it is my first raised bed, yes you are right! It is a miniature raised bed. It is very simple and easy to make. You just need a square container, potting soil, ice cream stick, glue, seeds and ornamental sand or gravel, I used sand. I found it a fun method of growing lettuce on container.
Below is before the seeds germinated.
Some seeds didn't germinate and I plant sansievera on an empty bed. Well, you can make your own miniature raised bed and just have fun! Happy gardening. :)