I am having some difficulty wrapping my mind around raspberry vodka. Somehow the two just don't mix for me. I would, however, entertain raspberries as a garnish or maybe frozen in ice cubes and then added to the drink. That would be pretty too.
Skittles infused vodka is extremely easy. You just get a big bag of Skittles, separate the colors, and drop them into individual water bottle sized bottles of vodka. Wait 3-4 days and the Skittles will be dissolved and you'll have a highly potent, but very delicious drink.
I would assume you could also find some type of hard raspberry candy as well and start the same process. I haven't personally done this but I'll give it a try tomorrow and let you know how it turns out in a few days.
Just take half a pint of raspberries, about 3/4 cup of sugar, and a bottle of vodka (750 mL). Combine them, store in a cabinet, and pull it back out when you're ready to drink. The longer you leave it, the stronger it'll taste, of course. Pour it through a sieve when you're ready to use it to get any extra sugar and berries out so it's a smooth drink.