Is it a morning tea or afternoon tea - if so you could also go sweet.
Scones with Jam and cream;
banana bread baked in a slice tin and then cut into squares;
Fruit platter;
Mini muffins;
Lemon and yoghurt bundt cake
If you looking for something savory then
Amy's little quiches
Savory muffins
Zucchini slice
Dips and crackers
Arancini balls