You can use them as a substitute for ham in Eggs Benedict- more vegetarian but not less fat- avocados have a lot of it, they are the fattest of all veggies, that's what makes them so yummy

You can put them in halves and fill them, with shrimp e.g.
You can slice them as long as they are not too soft ( a day or two earlier as the optimum guacamole date) and serve them as a starter with a vinaigrette to which you added small diced tomatoes.
You can dice them (also as long as they are not too soft) and add them to salads.

What you can't do as far as I know: freeze them. So you better go to your local market and sell 150