Thanks also, 1tess, for the help with making a table. I will try to figure that out eventually, as it does seem like the best solution.

.image-attachment .entry-content .entry-attachment {
background: transparent;
}

.wp-caption {
background: transparent;
}

But then again, I have inserted rows of 3 or 4 images without tables on several of my most recent posts. Don't know if a CSS solution would be easier?…

You don't need CSS to insert tables. A row of images, followed by a row of "captions" followed by another pair of rows.

Look here:
http://onecoolsitebloggingtips.com/2010/03/24/align-images-html-tables-for-wordpress-blogs/

Images with captions have the sort of formatting you describe because it is part of the CSS of the themes.

I am having trouble getting my homepage to look how I want. I want the four images on http://kaylajenkins.com to be evenly spaced horizontally and vertically (kind of like a 2x2 table). I thought that one way to do this might be to increase the margins horizontally between the photos on each row, but whenever I do this, the gray boxes end up all out of alignment and no longer fit around the images. I've noticed that these boxes/frames only show up when an image has a caption. I do have the CSS upgrade--is there a way to get rid of all gray frames around images? (I don't like the way they look in gallery images either, like this ) Alternatively, should I be editing the HTML code?

Also, if there are any tricks you can tell me to help me basically create a grid of evenly spaced images, that would be extremely helpful, as this is how I'll usually want to display images in the future.

Thanks in advance for the help!