- Unfortunately, I don't think there is a way to do that. Even if you could provide multiple colors as input, you would also need to tell the gallery which colors go with which images. I am almost certain there isn't a way to do that.
- Some unsolicited advice
- The HTML center tag is deprecated. It is generally suggested that CSS be used to center objects/text. That being said, the image syntax actually provides a way to center the image.
- If you follow the first bullet, the br tags after the centered images are also not necessary. Even if you want to keep them, I would suggest using self-closing tags instead of having unmatched opening tags.
Right now, you have:
<center>
[[File:California Text.png|300px]]<br>
[[File:ElSerenoFTWD.jpg|250px]]<br>
[[File:El Sereno.png|250px]]<br>
</center>
What I would suggest (i.e. you don't have to make the changes):
[[File:California Text.png|center|300px]]
[[File:ElSerenoFTWD.jpg|center|250px]]
[[File:El Sereno.png|center|250px]]