My local Mexican market has pre-made tostadas and they aren't bad at all. They fry tortillas until crisp and it's about as simple as that.
We had "bachelor night" at my place with Hijo Numero Uno. That meant lots of X-Box and easy food.
The nice thing about tostadas is that that everyone can make them how they like. A layer of refried beans is traditional and after that, it's as you like. I made mine with chicken, dandelion greens and hot sauce.
I'm thinking that these might be great with whole beans and ceviche.