While not all of them, there has been an explosion in Keen 5 sprite patches over the last week or so, which have been uploaded tot he patch index, with the promise of many more to come. This is due to Ceilick's Keen 5 mod, which requires quite a lot of interesting patches.
So if you're interested, check them out at: http://levellord.toxicsheep.com/Index/Keen%205/