You mean like this? When composing your post, go to HTML view. Copy in the following HTML code for a one-by-two table:
!<table><tbody><tr>
!<td>your pic here</td>
!<td>your pic here</td>
!</tr></tbody></table>
Remove the exclamation marks (which I put in to stop Blogger thinking that the HTML was HTML!), then go to the normal Compose view and replace the words 'your pic here' with your picture using the usual 'insert image' feature. Well, you did ask!