At any time you can have your students make up their own Ensalada stories, using the familiar characters or other veggie characters of their own creation (my students have come up with Luis Lechuga and others). You might find it useful to require that they employ specific verbs or other vocabulary words that they've just been introduced to in your textbook. It can be fun to give groups of students the choice of preparing these stories in the form of an illustrated book, a cartoon with several panels, or a skit or puppet show which they present to the class. Be sure to display the books and cartoons so that students can enjoy each others' creations.
For your own purposes, as teachers, you might want to create your own stories as well. These might be short, TPR-storytelling-type stories that target particular vocabulary sets or grammatical structures you are working on in your class. These would lend themselves to the creative manipulation that makes TPRS so much fun -- and effective! -- for students. Or they might be longer, similar in length to the existing episodes. Such stories need not fit into the serial progression of the existing soap opera; rather, they could be considered as taking place at the same time as the other stories.
For example, there could be a story introducing a new student, Beatriz Berenjena (la hija del juez, tal vez), who is very impressed by Antonio Apio (now that he's doing much better in school, thanks to Felipe's tutoring) and starts going out with him. But it turns out her parents are not too happy that she's dating an apio. The students could each write their own ending to a story such as this.
If you come up with a story that lends itself well to presenting a specific grammatical structure, tense, set of vocabulary words, etc., or that effectively stimulated the students' creativity and use of Spanish, please consider posting it here. Other teachers and students will benefit from it! I could either create a page for it as part of this website and link it to the "Gallery of Creative Ideas," or, if you have it online, I could just link to your site! Contact me at scampbell@eee.org.