Well after much messing around, editing the code for the blogger template, I think I am now happy with how it looks. The page is slightly wider with a revised banner, the alignment has been tweaked all over and I have given the postings themselves a border and a slightly lighter background. It bugged me before in that sometimes the embedded images looked like they were off-centre visually, even though they were not! Now that the eye has a more obvious point of reference with the box surrounding each post, they look centred.
I also added in a clustrmaps widget so I can see where everyone is visiting from.
If anyone has feedback on the look of this blog, good or bad, please email me!