If you had rectangular/banquet tables instead of round tables, how did you arrange them?

Our venue pushed two rectangular tables together to create larger tables. It worked out well in the rectangular-shaped space we were in. People were comfortable and could easily talk to one another, more so than you sometimes can at large round tables where you can hear only the person sitting on either side of you. Depending on how many people were seated at a table, some had people at the heads, others did not. We made our own centerpieces that were long and low so they filled up the middle of the table and accentuated that longer look. In the space we were in, it was much better than a bunch of smaller separated tables or large round ones. See what works in the space you have.