I've not been too good at making sauces from scratch. I get lots of ideas but I seem to forget these ideas when I go shopping and end up buying the same stuff.
I frequently make tomatoe things from scratch, curries, chillies and other things like creamy mushrooms. I have tried to make my own BBQ sauce but it doesn't ever taste quite right.
One thing I am very lazy on is making dough and batter and variations (e.g. breaded chicken etc).