Create a DIY bead box with 24 grids by repurposing a plastic box. Use a ruler and marker to measure and mark a 4x6 grid on the top of the box, then carefully cut along the lines with scissors, creating 24 separate compartments. Strengthen the compartments by reinforcing with extra cardboard or tape if necessary. Cut lengths of string and place assorted beads in each compartment. Secure the strings to the box with glue or tape, ensuring the beads stay in place. Close the box, and your DIY bead box with 24 grids is ready for use.