The holy grail of mini fridge kegerator conversions is still the Sanyo 4912. You won't get more than 2 kegs in there (you'll want to step up to a small chest freezer or similar for that), but it's very easy to convert and has plenty of room.
If you do a search on 4912 kegerator, you'll get hundreds of results showing exactly how it is done.
"Brewing beer is a fun and rewarding hobby. When you do good, you get beer. When you do bad, you get beer. It's a lot like rec league softball"