Airplane food and the snacks you get on airplanes are not known for being appetizing. This website, Airline Meals has lots of pictures of airplane food, sent in by members of the public.
I never thought of taking a picture of my food, but next time, I'll definitely snap a couple and send them in. It's fun to look at what everyone else is getting. Now, nobody is going to plan their flights around the food – are they?
And the food that's pictured on the site is probably not offered all the time. Wouldn't it be nice to think it actually depends on what's in season? But by comparing several meals from one airline against another airline's food you can start to get an idea.
I picked an airline at random – Kenya Airways. While the first snack posted was pretty plain, there were some nicely presented, full-looking plates further down the page. It matters a lot where your flight originates, since that's usually where the food comes from.