I would recommend buying some 'white' decal paper. I usually get mine from Micromark, they sell a 'starter kit' with paper, and fixative.
Then, download these
http://www.bolterandchainsword.com/files/file/249-raven-guard-logo-sheet-bols/
Print them on the decal paper, seal with fixative, then use like regular transfers. I've made my own FleshTearer decals, and they worked great when applied with either micro-sol/micro-set or the decal system sold by Micromark (I've used both).