Last summer I made each one of my students a letter jar. Each letter jar contains all of the letters in the alphabet. I have each container labeled and each letter card numbered on the back with the same number. This makes it easy if I find one on the floor I know which container it belongs too. The kiddos keep these at their desks and if they get done early or are trying to write a word and want to use them for sounding words out to look at spellings to see if it looks right they just take them out of their basket and use them!