Sandwiches are an easy thing to make when you need to eat alone. Two slices of bread and a filling and you're ready -- and you have a perfect single serving size.
But plain old sandwiches can get boring pretty fast. One easy way to add some variety is to use different types of bread. For example, you can make a peanut butter sandwich on your basic grocery store sliced loaf... or you can make it on a fresh bun taken right out of the oven (the peanut butter gets all nice and gooey when you do this!) Or instead of making that turkey sandwich on two slices of bread, why not split a croissant in two and use that? Or a pita? Or a tortilla wrap? A bagel? A biscuit? Some kinds of sandwiches are even pretty nice when served on sweet breads or scones -- for example, sausage and cheese on blueberry bread (it sounds weird at first but it really does work.) And then there are those fancy gourmet breads you can get -- spinach bread, rye, sourdough, herb focaccia... You can buy a different kind of bread each week as a way to keep up some variety in your world of sandwiches.