I run my raspberries through my food strainer attachment on my kitchen aide because I don't like seeds in my smoothies or raspberry ice tea. Then you can just ladle the juice into ice cube trays or you can sweeten it a little first with the sweetener of your choice. When they are frozen, I just pop them out and store them in a baggie in the freezer.
They are so easy to use to make smoothies or to add to your ice tea instead of regular ice cubes. My son likes to suck on them like a Popsicle.