I was inspired by girl scouts for this idea. Print and laminate these "badges" to award writers who are using proper conventions. Goals center around using finger spaces, starting with a capital letter, ending with punctuation, writing all lowercase, using the word wall, and making characters think and feel.
I laminate these, velcro them to their folder for a visible goal or reminder, and then when they consistently achieve their goal it goes on the bulletin board (see pictures in preview). It will make your job easier because you'll be able to hold students accountable for using proper conventions during writing and also make it easy to track what goal they are currently working on!
If their are other areas of writing you would like more "badges" for feel free to contact me and I'll make you a set specific to your writing needs!