How to make excuses for all of the Peashooting plants look like Gretchen.

You see, I'm modding Plants vs. Zombies. I wanted Gretchen to be the peashooter and the rest of the Peashooting plants to look like other Fireside Girls. But all of the Peashooting plants heads use the same template (except for snow pea) meaning all of the peashooting plants look like Gretchen! (derp) So I came up with some excuses. Here they are! That's all.
 * Peashooter - Plain Ol' Gretchen
 * Repeater - It's actually ALTERNATE Gretchen
 * Threepeater - Gretchen is in a set of quadruplets and these are the other 3.
 * Split Pea - An expirement gone HORRIBLY wrong
 * Gatling Pea - Alternate Gretchen in army equiptment