Alternative to wedding cake

One of my cousins had a croquembouche (profiterole tower). Another had a cupcake tower. I've also seen a wedding that had a 'cheese' cake (whole cheeses stacked up to look like a 3-tier cake). Or you can have an ordinary cake that's a different flavour, not fruit.

Here are a few shots of cheese towers and mini cake towers

I have never seen a doughnut tree - sounds interesting, but I have seen a doughnut board that stood upright with wooden dowels that the doughnuts hung off.

Think of what desserts you and your partner love and go from there. You can have multiple desserts set up on a table and just have a small cake for your to cut into if you want to have those cake cutting photos but don't want to eat cake or don't think many will eat it. You can also have a chocolate fountain with multiple different dipping items for it. Honestly depends on what you guys enjoy and love.