My current go to is to stove pop some popcorn the "ol fashion way". A bit of butter and I play around with my spice cabinet to flavor. Lately, my favorite is nutritional yeast. It's a little similar to marmite in flavor, but cheesier in my opinion. Plus, it's got protein and NO potassium or phosphorus. It also makes an OK substitute for Parmesan on spaghetti.
Nutritional info on Nutritional Yeast here:
http://nutritiondata.self.com/facts/custom/1323565/2I also tend to make a lot of Rice Crispy Treats. It gives me the texture I'm craving in a snack. And I'm really just wanting that good CRUNCH, I'll chomp on some ice.