Glue a tray according to your needs.
In our example, we first glued a frame made from a total of 8 craft blocks. To do this, glue 2 blocks together 4 times on the short, narrow side. Then glue them together to form a square.
The inner part of the frame is finished with blocks by sawing 2 cm off some of the blocks. Glue the blocks to the outer edge (as shown in the picture) as a border.
Glue another frame upright on the tray at a distance of approx. 2 cm from the edge.