November is a great time for cakes. I love fall flavors.
Apple spice (could use a caramel filling)
Browned butter pecan
Praline filling would go well with any of these flavors. You can make it yourself and grind it (which I've done) or buy a commercial paste (much smoother). Just mix the praline into your buttercream. I highly recommend using a meringue buttercream like Italian meringue buttercream or Swiss meringue buttercream if you're going to use the praline paste. Mixing it into a powdered sugar based icing would make it way too cloying. The flavors I listed above also go very well with cream cheese filling or icing.
Raspberry is great paired with lemon. There are lots of great raspberry filling recipes. For fall I'm more inclined to go with one of the flavors listed above because it's more seasonal. Lemon and raspberry scream spring/summer to me. But of course you can do it however you want.