I may get flamed for this but that woudn't be anything new lately, anyway you can't change the shape of your bicep, but I do believe you can emphasize certain areas of it. I never used to have a peak to my biceps, but since I started preacher curls and incline dumbell curls a few years back, I have grown a noticable one. Basically though, the bigger your bi's get, the bigger the peak will be.