When you are not in a crisis situation, it is a good time to experiment with the seasonings and spices that make the mixes you like the best. Most of the mixes can be made at home and you can pre-mix the spices in small quantities to keep on hand. Buying the basic spices and mixing your own can save you money and storage space. Rice-a-Roni for example is rice (surprise!) and small broken pieces of spaghetti noodles. When I taste a mix I really like, I collect as many recipes as I can for it (the internet is a real help) and then sort through them for ingredients common to most of the recipes, and then look at ways I can work with the ingredients for storage. I make it like a game to see how I can work it out, but then I am particularly blessed in that my guys will eat my experiments without drama - although there seems to be a great deal of entertainment factor in the failures.
I have some recipes I've worked out like that but I'm never sure if anyone is interested beyond my front door so I haven't posted them. I'll be glad to add them to the recipe section if you are interested in any particular mix flavors.
Add: I store the spice mixes separately from the rice/noodles. For quick mixes for my guys if I'm not cooking, I have some 1/2 pint jars with the rice/noodles premeasured in one and the spice mix pre-measured in another.