I ended up taking ideas from everyone and made up my own!

I like couscous or bulgur in mine! I usually just wing it, though...

Sautee: Ground meat, mushroom; seasoned with garlic, lemon zest, cinnamon, allspice, oregano, mint; then add cooked rice off heat.
Scoop the zukes out and coat with olive oil and lemon juice or let them soak in that a bit before stuffing.
Stuff and bake...Topped with a Greek Tomato sauce. (tomato sauce with garlic, parsley, cinnamon, allspice and oregano).

Oh...do the scoop out the zukes first and chop that up and add it to stuffing mixture.

Tomato, onion, sausage, and the scooped out zucchini flesh,, topped with garlicky, herby, parmesan-y bread crumbs, yum!

cooked rice, basil, and mozzarella cheese. My landlord served this for dinner one night. She used the round zucchini, think they're called eight-ball zucchinis.