Blaine and I have tinkered around with making our own salsa ever since we've been married. I made a pretty good one today.
1 large can diced tomatoes, drained
1/2 large onion, chopped
fistful of cilantro (like 1/4 cup full or something)
Juice from half a lime (or just....lime juice or lemon juice)
2 teaspoons of chili powder (or more!)
2 nacho jalepenos (like those slices you put on nachos)
1/4 C green pepper, sliced
1 tsp minced garlic
Put all ingredients in the blender and pulse until nicely combined, if you blend too much your salsa will be to juicy. Also, you may want to put all the other stuff beneath the tomatoes, since the other ingredients take longer to blend (chop or whatever).