Word wall words
What a teacher at my school does is instead of spelling words she comes up with 5 Word Wall WOrds (chosen from their writings) each week. On Mondays they have to write sentences with these words (at least 6 words per sentence) and they studey the whole sentence all week. On Friday the Word Wall Test is given and they have to write their whole sentence (or a new one if they can't remember it). The word wall words are on the board but the catch is that they have to spell EVERY word in their sentence correctly. The sentences are numbers 1-5, for 6-10, she will say things like "You know how to spell house (one of the WWW), now spell mouse."
Each student has their own Word Wall too (my idea to her haha), made out of 2 file folders taped together forming a "test folder" as well. All of their past WWW's are on their wall and they are incouraged to use those as well.