There's lots of options and people are always willing to sample and give you there thoughts.
You could do cream cheese with mozzarella, Italian seasoned croutons (crushed up and crumbled), pepperoni (sliced up small), and Italian sausage crumbles for a 'meat lovers" pizza twist (it's already wrapped in bacon!). If you like Hawaiian pizza, substitute strained pineapple chunks for the pepperoni.
Or go the Greek route with cream and goat cheese, minced lamb meat, spinach, and chopped onions & tomatoes for a gyro flavor. (the bacon will take it in a whole new direction)
If you really want to push the envelope, a lot of people like raspberry-chipotle flavored stuff, so mix some raspberry jam or preserves, cream cheese, and crushed Ritz crackers (as a filler) to a consistency and balance that is good for stuffing/filling jalapenos. The slight Jalapeno heat will substitute for the chipotle pepper. This is a great appetizer that will get people talking.
Good luck.