How Can I Change Size/Position of Featured Images for Blog Posts?

Team WPUM,

I'm putting together a blog style site and there are several areas where I would like to change how the blogs are presented in a post list.

Mainly, I would like to be able to have the option to have a 150x150 featured image to the left, while title and excerpt are to the right. I suppose, the "standard" blog listing, if there is one.

I see no way to adjust the size and position of featured images using Upfront, and CSS access to certain elements is very confusing at times.

Can you provide some help in the styling of post lists, and can better post styling tools be added to the features list for the next Upfront update (or the rumored new Builder tool?)