I didn't take too many pictures--was in a rush to get everything done. A friend probably has more pics with them all cut up and fancy looking.
(Ignore the things in the top left corner...)

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You pretty much need four things. Red beans, Rock sugar, Evaporated milk, and Shaved ice.
Soak the beans over night. Discard the water/liquid, Then boil them until they're soft. (They should expand a lot.)
Melt the rock sugar. Have a pot of water--don't need too much (this is because you'll be adding in the shaved ice later and it'll be diluted). Heat it up and add in the rock sugar. It should end up pretty thick.
Wait for beans/sugar water to cool.
Grab a container. Add in as much of the beans, syrupy sugary water, shaved ice, and evaporated milk as you'd like. You can play around with the proportions till you're satisfied.
And that's pretty much it... currently don't have time to show you with pics and everything... maybe in the summer... hopefully this was helpful.