Until I heard about hi ratio shortening, I always made my buttercream with just butter. I never had any complaints, and many said they loved it. I never cared for it myself, though.
I guess if you don't want to make it with all butter you could always just use hi ratio shortening, so when she asks "Is this made with crisco?", you can truthfully say it is NOT! 
After all crisco is a brand name, not the name for all shortening.
Seriously, though. Just butter works fine. 
Instead of 1/2 cup of shortening and 1/2 cup of butter, I would use 1 cup of butter. The rest of the ingredients were the same. I guess it all depends on the recipe you're using.
Good luck! I hope this helps!
Holly
Falenn If your recipe calls for 2 sticks of butter and 1 cup of crisco and you want to use all butter, you will use 4 sticks of butter. 1 stick of butter is equal to 1/2 cup. Just a note.. your frosting will be different tasting that the 1/2 butter 1/2 crisco. It may need to be refrigerated to firm up, any may not crust as well. An all butter frosting is very rich tasting to me,.. very good.. but not what you may be used to.
Yes you would replace the portion that you use Crisco with butter. I prefer the taste better with butter, but I do like rich desserts. You may need slightly more sugar as butter has a higher water content than Crisco. It can take a little bit longer to crust up and doesn't hold up as well in heat.
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