I can't wait for the summer -
Fill with fruit chunks and some fruit juice/water and freeze.
A great, cold outside treat for the dogs. Of course, my dog always goes in the dirt and eats it so it seems nasty but he still likes it.

But year round I constantly fill them with kibble, treats, leftover meat from dinner, peanut butter, etc.
I need to try the kibble & gravy. I bet he'd LOVE that!