Applying Spelling Rules

We run a word study program in our county. My kids do great on their weekly work and rock their spelling tests. But then some turn around the next day, or maybe even the next hour and misspell that type of word in their writing. So frustrating!
In an attempt to get them to become more accountable we've made a number of these posters that hang on our wall. I will no longer fix their spellings but refer them to the poster and they must do it themselves. I try to make sure they are involved in the making of the reference posters. Here is the one we recently made for Plural Nouns:

Do you use hand paddles in your class? I love them and would say they are one of my favorite instructional tools to use (outside of my smartboard of course). I love them because everyone can respond to a question at the same time. I got these from Oriental Trading years ago and they have held up well. Here we are using them to practice the application of the rules we are learning.

My thought is repetition, repetition, repetition. So we played a game called Roll A Snowman to practice the spelling of these kinds of words. Player one reads a word off of player two's spelling list. Player Two writes it on the recording sheet. Player One checks it and if it is correctly spelled Player Two gets to roll the die and draw the part of the snowman indicated in the rules box. They continue in this manner until someone has a complete snowman drawn.
The game idea of Roll A Snowman came from "Little Giraffes". http://www.littlegiraffes.com/ I used to use this sight all the time when I taught preschool.
Here is an example of a player's sheet:

Here is the document if you would like it. Like how I botched the spelling of the Link Title?? Maybe I should have edited myself! My students would be giving me grief right about now. Ha!

Roll as Now Man 0001
Please share...How do you get your kids to apply what they have learned about spelling? Any tips would be appreciated by all!