This is from a cookbook from Our Ultimate Home, a message board I was on several years ago (now defunct, sadly). It got rave reviews on the boards, and when I made it for my family last week, they gave it rave reviews, too!
1 roast (I used an arm roast - you can probably go with whatever's on sale)
1 packet Italian dressing mix
1 packet ranch dressing mix
1 packet brown gravy mix
1/2 cup water
Place the roast in the crockpot. Sprinkle the dry packet ingredients over the roast. Pour 1/2 cup water over the top of the roast. Cook on low for 8 hours.
Next time, I think I'll add some potatoes, carrots and onions to make it a one-pot meal. And we found out that the leftovers make really good hash. Brian cooked some frozen potatoes o'brien and onions until the potatoes were mostly done, added some eggs, and when the eggs were about halfway done, added some chopped-up roast. Talk about a good breakfast! So it's two yummy meals in one.