What kind of frosting has similar texture to the major grocery brands?
It sounds like you might be happy with Wilton Buttercream ... which is mostly whipped shortening and powdered sugar.  I don't have the recipe on me right now, but I did post a variation of the recipe to a related question a few years ago:  https://cooking.stackexchange.com/a/4869/67

Depending on how soft you make it (how much water you add) and how humid it is, after a bit of drying, it'll form a crust that you can use to your advantage (lay on some waxed paper, then press out any ridges).  You can then cover it so it won't dry out too much.

The important part of the process is a stand mixer, so you can leave it mixing for a really long time.