I shop whenever I get the chance. I buy stuff like dry, frozen or canned goods that I have no intention of using anytime in the near future. This way, I decide what I am going to eat by looking in my pantry, or freezer. I may have to pick up a fresh thing or two, to compliment or finish the dish, but the majority is usually here to begin with.
So, I advise you to get shopping and try and keep a good variety of non perishable items on hand. It will help you decide. Leave some cookbooks laying around on your coffee table, for example. You can browse them while relaxing and possibley get your creative juices flowing.
I also like to cook classics. Every nationality and region has them. I may not stick to the recipe, but I make up my version with what I have around. I have been known to work my way across Europe via my kitchen.
We used to have a fish night, where we ate some kind of fish dish once a week. It was never the same and was fun to decide and plan for. Then Friday nights are still pizza nights around here. I always try and cook some different kind of pizza, weather it be deep dish, authentic thin crust, calzone, frozen, bisquick crust, whatever. As long as it isn't the same thing every week and I get to try different recipes and techniques.
We eat lots of steak, here. It is one of our favorites. So, to change it up a bit, I try to make different side dishes everytime. I make a point of trying something I have never made before.
Lots of different ways to cook and enjoy your favorite foods.
So many recipes, so little time...