For the creative ones, please help!

The peace sign!

Hmmm I suppose It depends what あなた are doing it for... Are making a symbol for some sort of book are a motif in an artwork?

Perhaps あなた should put that into consideration before あなた make any decisions. Also look up symbolism that would in fact represent murder または extermination. An example might be blood または the colour red. Find 映画 または 本 that affiliate with that genre and try and write things down. If things get desperate あなた could even maybe appropriate a デザイン that appeals to あなた and just use that.... That's what I would do anyway. I hope that helps friend! ^^