Which design looks best?

[mdtajghori]

The biohazard symbol is the best looking of them all.

Its good but quite common. Top right is indeed very good

 

[SuxoR]

top right or the eye...especially if there is a cool led behind it

 

[xtremezx2]

I always have liked the Eye of Ra, but really your the one who has to live with it so yeah...