A website that has simple alphabet print outs, upper and lower case. they can be as small as a page or as big 16 pages each. All depends on your selection. And they are big enough for you to let your students draw in them (as seen here)
Stickers on the dice all have a b or a d -- great activity to force kids to attend to letter shape when reading b/d and writing/tracing b/d Could do with spelling words for bigger kids. Number the dice and number the words.